diff --git a/include/base/cef_bind.h b/include/base/cef_bind.h
index 7211ebf03..66022ff34 100644
--- a/include/base/cef_bind.h
+++ b/include/base/cef_bind.h
@@ -97,20 +97,20 @@ namespace base {
 /// Bind as OnceCallback.
 ///
 template <typename Functor, typename... Args>
-inline OnceCallback<internal::MakeUnboundRunType<Functor, Args...>> BindOnce(
+inline OnceCallback<cef_internal::MakeUnboundRunType<Functor, Args...>> BindOnce(
     Functor&& functor,
     Args&&... args) {
-  static_assert(!internal::IsOnceCallback<std::decay_t<Functor>>() ||
+  static_assert(!cef_internal::IsOnceCallback<std::decay_t<Functor>>() ||
                     (std::is_rvalue_reference<Functor&&>() &&
                      !std::is_const<std::remove_reference_t<Functor>>()),
                 "BindOnce requires non-const rvalue for OnceCallback binding."
                 " I.e.: base::BindOnce(std::move(callback)).");
   static_assert(
       conjunction<
-          internal::AssertBindArgIsNotBasePassed<std::decay_t<Args>>...>::value,
+          cef_internal::AssertBindArgIsNotBasePassed<std::decay_t<Args>>...>::value,
       "Use std::move() instead of base::Passed() with base::BindOnce()");
 
-  return internal::BindImpl<OnceCallback>(std::forward<Functor>(functor),
+  return cef_internal::BindImpl<OnceCallback>(std::forward<Functor>(functor),
                                           std::forward<Args>(args)...);
 }
 
@@ -118,13 +118,13 @@ inline OnceCallback<internal::MakeUnboundRunType<Functor, Args...>> BindOnce(
 /// Bind as RepeatingCallback.
 ///
 template <typename Functor, typename... Args>
-inline RepeatingCallback<internal::MakeUnboundRunType<Functor, Args...>>
+inline RepeatingCallback<cef_internal::MakeUnboundRunType<Functor, Args...>>
 BindRepeating(Functor&& functor, Args&&... args) {
   static_assert(
-      !internal::IsOnceCallback<std::decay_t<Functor>>(),
+      !cef_internal::IsOnceCallback<std::decay_t<Functor>>(),
       "BindRepeating cannot bind OnceCallback. Use BindOnce with std::move().");
 
-  return internal::BindImpl<RepeatingCallback>(std::forward<Functor>(functor),
+  return cef_internal::BindImpl<RepeatingCallback>(std::forward<Functor>(functor),
                                                std::forward<Args>(args)...);
 }
 
@@ -175,8 +175,8 @@ RepeatingCallback<Signature> BindRepeating(
 /// to compile because Foo does not support the AddRef() and Release() methods.
 ///
 template <typename T>
-inline internal::UnretainedWrapper<T> Unretained(T* o) {
-  return internal::UnretainedWrapper<T>(o);
+inline cef_internal::UnretainedWrapper<T> Unretained(T* o) {
+  return cef_internal::UnretainedWrapper<T>(o);
 }
 
 ///
@@ -201,12 +201,12 @@ inline internal::UnretainedWrapper<T> Unretained(T* o) {
 /// </pre>
 ///
 template <typename T>
-inline internal::RetainedRefWrapper<T> RetainedRef(T* o) {
-  return internal::RetainedRefWrapper<T>(o);
+inline cef_internal::RetainedRefWrapper<T> RetainedRef(T* o) {
+  return cef_internal::RetainedRefWrapper<T>(o);
 }
 template <typename T>
-inline internal::RetainedRefWrapper<T> RetainedRef(scoped_refptr<T> o) {
-  return internal::RetainedRefWrapper<T>(std::move(o));
+inline cef_internal::RetainedRefWrapper<T> RetainedRef(scoped_refptr<T> o) {
+  return cef_internal::RetainedRefWrapper<T>(std::move(o));
 }
 
 ///
@@ -234,14 +234,14 @@ inline internal::RetainedRefWrapper<T> RetainedRef(scoped_refptr<T> o) {
 /// reference to the callback is deleted.
 ///
 template <typename T>
-inline internal::OwnedWrapper<T> Owned(T* o) {
-  return internal::OwnedWrapper<T>(o);
+inline cef_internal::OwnedWrapper<T> Owned(T* o) {
+  return cef_internal::OwnedWrapper<T>(o);
 }
 
 template <typename T, typename Deleter>
-inline internal::OwnedWrapper<T, Deleter> Owned(
+inline cef_internal::OwnedWrapper<T, Deleter> Owned(
     std::unique_ptr<T, Deleter>&& ptr) {
-  return internal::OwnedWrapper<T, Deleter>(std::move(ptr));
+  return cef_internal::OwnedWrapper<T, Deleter>(std::move(ptr));
 }
 
 ///
@@ -277,8 +277,8 @@ inline internal::OwnedWrapper<T, Deleter> Owned(
 /// an object owned by the callback.
 ///
 template <typename T>
-internal::OwnedRefWrapper<std::decay_t<T>> OwnedRef(T&& t) {
-  return internal::OwnedRefWrapper<std::decay_t<T>>(std::forward<T>(t));
+cef_internal::OwnedRefWrapper<std::decay_t<T>> OwnedRef(T&& t) {
+  return cef_internal::OwnedRefWrapper<std::decay_t<T>>(std::forward<T>(t));
 }
 
 ///
@@ -329,12 +329,12 @@ internal::OwnedRefWrapper<std::decay_t<T>> OwnedRef(T&& t) {
 ///
 template <typename T,
           std::enable_if_t<!std::is_lvalue_reference<T>::value>* = nullptr>
-inline internal::PassedWrapper<T> Passed(T&& scoper) {
-  return internal::PassedWrapper<T>(std::move(scoper));
+inline cef_internal::PassedWrapper<T> Passed(T&& scoper) {
+  return cef_internal::PassedWrapper<T>(std::move(scoper));
 }
 template <typename T>
-inline internal::PassedWrapper<T> Passed(T* scoper) {
-  return internal::PassedWrapper<T>(std::move(*scoper));
+inline cef_internal::PassedWrapper<T> Passed(T* scoper) {
+  return cef_internal::PassedWrapper<T>(std::move(*scoper));
 }
 
 ///
@@ -357,8 +357,8 @@ inline internal::PassedWrapper<T> Passed(T* scoper) {
 /// </pre>
 ///
 template <typename T>
-inline internal::IgnoreResultHelper<T> IgnoreResult(T data) {
-  return internal::IgnoreResultHelper<T>(std::move(data));
+inline cef_internal::IgnoreResultHelper<T> IgnoreResult(T data) {
+  return cef_internal::IgnoreResultHelper<T>(std::move(data));
 }
 
 #if defined(OS_APPLE) && !HAS_FEATURE(objc_arc)
diff --git a/include/base/cef_callback.h b/include/base/cef_callback.h
index 7034ff925..456afd399 100644
--- a/include/base/cef_callback.h
+++ b/include/base/cef_callback.h
@@ -83,18 +83,18 @@
 namespace base {
 
 template <typename R, typename... Args>
-class OnceCallback<R(Args...)> : public internal::CallbackBase {
+class OnceCallback<R(Args...)> : public cef_internal::CallbackBase {
  public:
   using ResultType = R;
   using RunType = R(Args...);
-  using PolymorphicInvoke = R (*)(internal::BindStateBase*,
-                                  internal::PassingType<Args>...);
+  using PolymorphicInvoke = R (*)(cef_internal::BindStateBase*,
+                                  cef_internal::PassingType<Args>...);
 
   constexpr OnceCallback() = default;
   OnceCallback(std::nullptr_t) = delete;
 
-  explicit OnceCallback(internal::BindStateBase* bind_state)
-      : internal::CallbackBase(bind_state) {}
+  explicit OnceCallback(cef_internal::BindStateBase* bind_state)
+      : cef_internal::CallbackBase(bind_state) {}
 
   OnceCallback(const OnceCallback&) = delete;
   OnceCallback& operator=(const OnceCallback&) = delete;
@@ -103,10 +103,10 @@ class OnceCallback<R(Args...)> : public internal::CallbackBase {
   OnceCallback& operator=(OnceCallback&&) noexcept = default;
 
   OnceCallback(RepeatingCallback<RunType> other)
-      : internal::CallbackBase(std::move(other)) {}
+      : cef_internal::CallbackBase(std::move(other)) {}
 
   OnceCallback& operator=(RepeatingCallback<RunType> other) {
-    static_cast<internal::CallbackBase&>(*this) = std::move(other);
+    static_cast<cef_internal::CallbackBase&>(*this) = std::move(other);
     return *this;
   }
 
@@ -142,7 +142,7 @@ class OnceCallback<R(Args...)> : public internal::CallbackBase {
   OnceCallback<ThenR(Args...)> Then(OnceCallback<ThenR(ThenArgs...)> then) && {
     CHECK(then);
     return BindOnce(
-        internal::ThenHelper<
+        cef_internal::ThenHelper<
             OnceCallback, OnceCallback<ThenR(ThenArgs...)>>::CreateTrampoline(),
         std::move(*this), std::move(then));
   }
@@ -155,7 +155,7 @@ class OnceCallback<R(Args...)> : public internal::CallbackBase {
       RepeatingCallback<ThenR(ThenArgs...)> then) && {
     CHECK(then);
     return BindOnce(
-        internal::ThenHelper<
+        cef_internal::ThenHelper<
             OnceCallback,
             RepeatingCallback<ThenR(ThenArgs...)>>::CreateTrampoline(),
         std::move(*this), std::move(then));
@@ -163,18 +163,18 @@ class OnceCallback<R(Args...)> : public internal::CallbackBase {
 };
 
 template <typename R, typename... Args>
-class RepeatingCallback<R(Args...)> : public internal::CallbackBaseCopyable {
+class RepeatingCallback<R(Args...)> : public cef_internal::CallbackBaseCopyable {
  public:
   using ResultType = R;
   using RunType = R(Args...);
-  using PolymorphicInvoke = R (*)(internal::BindStateBase*,
-                                  internal::PassingType<Args>...);
+  using PolymorphicInvoke = R (*)(cef_internal::BindStateBase*,
+                                  cef_internal::PassingType<Args>...);
 
   constexpr RepeatingCallback() = default;
   RepeatingCallback(std::nullptr_t) = delete;
 
-  explicit RepeatingCallback(internal::BindStateBase* bind_state)
-      : internal::CallbackBaseCopyable(bind_state) {}
+  explicit RepeatingCallback(cef_internal::BindStateBase* bind_state)
+      : cef_internal::CallbackBaseCopyable(bind_state) {}
 
   // Copyable and movable.
   RepeatingCallback(const RepeatingCallback&) = default;
@@ -224,7 +224,7 @@ class RepeatingCallback<R(Args...)> : public internal::CallbackBaseCopyable {
       RepeatingCallback<ThenR(ThenArgs...)> then) const& {
     CHECK(then);
     return BindRepeating(
-        internal::ThenHelper<
+        cef_internal::ThenHelper<
             RepeatingCallback,
             RepeatingCallback<ThenR(ThenArgs...)>>::CreateTrampoline(),
         *this, std::move(then));
@@ -235,7 +235,7 @@ class RepeatingCallback<R(Args...)> : public internal::CallbackBaseCopyable {
       RepeatingCallback<ThenR(ThenArgs...)> then) && {
     CHECK(then);
     return BindRepeating(
-        internal::ThenHelper<
+        cef_internal::ThenHelper<
             RepeatingCallback,
             RepeatingCallback<ThenR(ThenArgs...)>>::CreateTrampoline(),
         std::move(*this), std::move(then));
diff --git a/include/base/internal/cef_bind_internal.h b/include/base/internal/cef_bind_internal.h
index 5f993e398..d81c363dc 100644
--- a/include/base/internal/cef_bind_internal.h
+++ b/include/base/internal/cef_bind_internal.h
@@ -97,7 +97,7 @@ struct BindUnwrapTraits;
 template <typename Functor, typename BoundArgsTuple, typename SFINAE = void>
 struct CallbackCancellationTraits;
 
-namespace internal {
+namespace cef_internal {
 
 template <typename Functor, typename SFINAE = void>
 struct FunctorTraits;
@@ -1259,7 +1259,7 @@ decltype(auto) BindImpl(Functor&& functor, Args&&... args) {
       std::forward<Functor>(functor), std::forward<Args>(args)...));
 }
 
-}  // namespace internal
+}  // namespace cef_internal
 
 // An injection point to control |this| pointer behavior on a method invocation.
 // If IsWeakReceiver<> is true_type for |T| and |T| is used for a receiver of a
@@ -1303,30 +1303,30 @@ struct BindUnwrapTraits {
 };
 
 template <typename T>
-struct BindUnwrapTraits<internal::UnretainedWrapper<T>> {
-  static T* Unwrap(const internal::UnretainedWrapper<T>& o) { return o.get(); }
+struct BindUnwrapTraits<cef_internal::UnretainedWrapper<T>> {
+  static T* Unwrap(const cef_internal::UnretainedWrapper<T>& o) { return o.get(); }
 };
 
 template <typename T>
-struct BindUnwrapTraits<internal::RetainedRefWrapper<T>> {
-  static T* Unwrap(const internal::RetainedRefWrapper<T>& o) { return o.get(); }
+struct BindUnwrapTraits<cef_internal::RetainedRefWrapper<T>> {
+  static T* Unwrap(const cef_internal::RetainedRefWrapper<T>& o) { return o.get(); }
 };
 
 template <typename T, typename Deleter>
-struct BindUnwrapTraits<internal::OwnedWrapper<T, Deleter>> {
-  static T* Unwrap(const internal::OwnedWrapper<T, Deleter>& o) {
+struct BindUnwrapTraits<cef_internal::OwnedWrapper<T, Deleter>> {
+  static T* Unwrap(const cef_internal::OwnedWrapper<T, Deleter>& o) {
     return o.get();
   }
 };
 
 template <typename T>
-struct BindUnwrapTraits<internal::OwnedRefWrapper<T>> {
-  static T& Unwrap(const internal::OwnedRefWrapper<T>& o) { return o.get(); }
+struct BindUnwrapTraits<cef_internal::OwnedRefWrapper<T>> {
+  static T& Unwrap(const cef_internal::OwnedRefWrapper<T>& o) { return o.get(); }
 };
 
 template <typename T>
-struct BindUnwrapTraits<internal::PassedWrapper<T>> {
-  static T Unwrap(const internal::PassedWrapper<T>& o) { return o.Take(); }
+struct BindUnwrapTraits<cef_internal::PassedWrapper<T>> {
+  static T Unwrap(const cef_internal::PassedWrapper<T>& o) { return o.Take(); }
 };
 
 #if defined(OS_WIN)
@@ -1351,7 +1351,7 @@ struct CallbackCancellationTraits<
     Functor,
     std::tuple<BoundArgs...>,
     std::enable_if_t<
-        internal::IsWeakMethod<internal::FunctorTraits<Functor>::is_method,
+        cef_internal::IsWeakMethod<cef_internal::FunctorTraits<Functor>::is_method,
                                BoundArgs...>::value>> {
   static constexpr bool is_cancellable = true;
 
diff --git a/include/base/internal/cef_callback_internal.h b/include/base/internal/cef_callback_internal.h
index 8be0a531e..f3435e9f7 100644
--- a/include/base/internal/cef_callback_internal.h
+++ b/include/base/internal/cef_callback_internal.h
@@ -43,7 +43,7 @@ namespace base {
 
 struct FakeBindState;
 
-namespace internal {
+namespace cef_internal {
 
 class BindStateBase;
 class FinallyExecutorCommon;
@@ -269,7 +269,7 @@ struct ThenHelper<OriginalCallback<OriginalR(OriginalArgs...)>,
   }
 };
 
-}  // namespace internal
+}  // namespace cef_internal
 }  // namespace base
 
 #endif  // CEF_INCLUDE_BASE_INTERNAL_CEF_CALLBACK_INTERNAL_H_
diff --git a/include/base/internal/cef_raw_scoped_refptr_mismatch_checker.h b/include/base/internal/cef_raw_scoped_refptr_mismatch_checker.h
index 61d341cea..124a329ae 100644
--- a/include/base/internal/cef_raw_scoped_refptr_mismatch_checker.h
+++ b/include/base/internal/cef_raw_scoped_refptr_mismatch_checker.h
@@ -47,7 +47,7 @@ namespace base {
 
 // This is a base internal implementation file used by task.h and callback.h.
 // Not for public consumption, so we wrap it in namespace internal.
-namespace internal {
+namespace cef_internal {
 
 template <typename T, typename = void>
 struct IsRefCountedType : std::false_type {};
@@ -68,7 +68,7 @@ struct NeedsScopedRefptrButGetsRawPtr
                 "NeedsScopedRefptrButGetsRawPtr requires non-reference type.");
 };
 
-}  // namespace internal
+}  // namespace cef_internal
 
 }  // namespace base
 
diff --git a/include/base/internal/cef_scoped_block_mac.h b/include/base/internal/cef_scoped_block_mac.h
index 474db2b63..e57ca5227 100644
--- a/include/base/internal/cef_scoped_block_mac.h
+++ b/include/base/internal/cef_scoped_block_mac.h
@@ -44,7 +44,7 @@
 namespace base {
 namespace mac {
 
-namespace internal {
+namespace cef_internal {
 
 template <typename B>
 struct ScopedBlockTraits {
@@ -53,12 +53,12 @@ struct ScopedBlockTraits {
   static void Release(B block) { Block_release(block); }
 };
 
-}  // namespace internal
+}  // namespace cef_internal
 
 // ScopedBlock<> is patterned after ScopedCFTypeRef<>, but uses Block_copy() and
 // Block_release() instead of CFRetain() and CFRelease().
 template <typename B>
-using ScopedBlock = ScopedTypeRef<B, internal::ScopedBlockTraits<B>>;
+using ScopedBlock = ScopedTypeRef<B, cef_internal::ScopedBlockTraits<B>>;
 
 }  // namespace mac
 }  // namespace base
diff --git a/libcef_dll/base/cef_callback_internal.cc b/libcef_dll/base/cef_callback_internal.cc
index 6a381b152..5651187f0 100644
--- a/libcef_dll/base/cef_callback_internal.cc
+++ b/libcef_dll/base/cef_callback_internal.cc
@@ -7,7 +7,7 @@
 #include "include/base/cef_logging.h"
 
 namespace base {
-namespace internal {
+namespace cef_internal {
 
 namespace {
 
@@ -97,5 +97,5 @@ CallbackBaseCopyable& CallbackBaseCopyable::operator=(
 CallbackBaseCopyable& CallbackBaseCopyable::operator=(
     CallbackBaseCopyable&& c) noexcept = default;
 
-}  // namespace internal
+}  // namespace cef_internal
 }  // namespace base