diff --git a/patch/patch.cfg b/patch/patch.cfg
index 22080326a..c945087be 100644
--- a/patch/patch.cfg
+++ b/patch/patch.cfg
@@ -437,7 +437,7 @@ patches = [
     'name': 'printing_context_2196',
   },
   {
-    # Disable thin archives with cef_sandbox builds.
+    # mac: Disable thin archives with cef_sandbox builds.
     # https://github.com/chromiumembedded/cef/issues/3674
     'name': 'build',
   },
@@ -519,23 +519,6 @@ patches = [
     # https://github.com/chromiumembedded/cef/issues/1872
     'name': 'base_command_line_1872',
   },
-  {
-    # Remove cef_sandbox dependency on boringssl functions.
-    # https://github.com/chromiumembedded/cef/issues/2743
-    #
-    # Avoid usage of std::atomic_flag::test() added in C++20.
-    # https://github.com/llvm/llvm-project/issues/57364
-    #
-    # Avoid usage of PartitionAlloc assertions (PA_BASE_CHECK) in raw_ptr.h.
-    #
-    # Disable use of Rust for JSON parsing with cef_sandbox.
-    # Enables the fallback to C++ that was removed in
-    # https://crrev.com/9ddc1624637c8cfa8ef50a95abd779e0ba4d67f6
-    #
-    # Avoid inclusion of undefined PartitionAlloc dependencies in Dawn after
-    # https://crrev.com/4dacf2b61c359950d2c2f1b5f9b9d079a01290a4
-    'name': 'base_sandbox_2743',
-  },
   {
     # Add RenderWidgetHostImpl::SetCompositorForFlingScheduler to fix fling
     # scrolling in OSR mode.
diff --git a/patch/patches/base_sandbox_2743.patch b/patch/patches/base_sandbox_2743.patch
deleted file mode 100644
index 1e3d7e0c0..000000000
--- a/patch/patches/base_sandbox_2743.patch
+++ /dev/null
@@ -1,315 +0,0 @@
-diff --git base/BUILD.gn base/BUILD.gn
-index 59721ed3c9e26..05926d66bb49b 100644
---- base/BUILD.gn
-+++ base/BUILD.gn
-@@ -41,6 +41,7 @@ import("//build/rust/rust_static_library.gni")
- import("//build/timestamp.gni")
- import("//build/util/process_version.gni")
- import("//build_overrides/build.gni")
-+import("//cef/libcef/features/features.gni")
- import("//testing/libfuzzer/fuzzer_test.gni")
- import("//testing/test.gni")
- 
-@@ -1531,7 +1532,13 @@ component("base") {
-     "hash/md5.h",
-     "hash/sha1.h",
-   ]
--  if (is_nacl) {
-+
-+  deps += [ "//cef/libcef/features:buildflags" ]
-+  if (enable_cef) {
-+    configs += [ "//cef/libcef/features:config" ]
-+  }
-+
-+  if (is_nacl || is_cef_sandbox_build) {
-     sources += [
-       "hash/md5_nacl.cc",
-       "hash/md5_nacl.h",
-diff --git base/allocator/dispatcher/dispatcher.cc base/allocator/dispatcher/dispatcher.cc
-index f680f63cffc5b..9cb615bbc8a5a 100644
---- base/allocator/dispatcher/dispatcher.cc
-+++ base/allocator/dispatcher/dispatcher.cc
-@@ -8,6 +8,7 @@
- #include "base/check.h"
- #include "base/dcheck_is_on.h"
- #include "base/no_destructor.h"
-+#include "cef/libcef/features/features.h"
- #include "partition_alloc/buildflags.h"
- #include "partition_alloc/shim/allocator_shim.h"
- 
-@@ -33,7 +34,7 @@ struct Dispatcher::Impl {
-   }
- 
-   void Reset() {
--#if DCHECK_IS_ON()
-+#if DCHECK_IS_ON() && !BUILDFLAG(IS_CEF_SANDBOX_BUILD)
-     DCHECK([&] {
-       auto const was_set = is_initialized_check_flag_.test_and_set();
-       is_initialized_check_flag_.clear();
-diff --git base/hash/md5.h base/hash/md5.h
-index 4d358570d81c5..09bf13a965541 100644
---- base/hash/md5.h
-+++ base/hash/md5.h
-@@ -11,8 +11,9 @@
- #include "base/base_export.h"
- #include "base/containers/span.h"
- #include "build/build_config.h"
-+#include "cef/libcef/features/features.h"
- 
--#if BUILDFLAG(IS_NACL)
-+#if BUILDFLAG(IS_NACL) || BUILDFLAG(IS_CEF_SANDBOX_BUILD)
- #include "base/hash/md5_nacl.h"
- #else
- #include "base/hash/md5_boringssl.h"
-diff --git base/hash/sha1.h base/hash/sha1.h
-index 2158b648ca58a..8a8cb13b2fd74 100644
---- base/hash/sha1.h
-+++ base/hash/sha1.h
-@@ -15,7 +15,9 @@
- #include "base/compiler_specific.h"
- #include "base/containers/span.h"
- #include "build/build_config.h"
--#if BUILDFLAG(IS_NACL)
-+#include "cef/libcef/features/features.h"
-+
-+#if BUILDFLAG(IS_NACL) || BUILDFLAG(IS_CEF_SANDBOX_BUILD)
- #include "base/hash/sha1_nacl.h"
- #else
- #include "base/hash/sha1_boringssl.h"
-diff --git base/json/json_reader.cc base/json/json_reader.cc
-index f32622d353f1d..def35a3ae1c5c 100644
---- base/json/json_reader.cc
-+++ base/json/json_reader.cc
-@@ -12,8 +12,9 @@
- #include "base/logging.h"
- #include "base/metrics/histogram_macros.h"
- #include "build/build_config.h"
-+#include "cef/libcef/features/features.h"
- 
--#if !BUILDFLAG(IS_NACL)
-+#if !(BUILDFLAG(IS_NACL) || BUILDFLAG(IS_CEF_SANDBOX_BUILD))
- #include "base/strings/string_view_rust.h"
- #include "third_party/rust/serde_json_lenient/v0_2/wrapper/functions.h"
- #include "third_party/rust/serde_json_lenient/v0_2/wrapper/lib.rs.h"
-@@ -21,7 +22,7 @@
- 
- // TODO(crbug.com/40811643): Move the C++ parser into components/nacl to just
- // run in-process there. Don't compile base::JSONReader on NaCL at all.
--#if !BUILDFLAG(IS_NACL)
-+#if !(BUILDFLAG(IS_NACL) || BUILDFLAG(IS_CEF_SANDBOX_BUILD))
- 
- namespace {
- const char kSecurityJsonParsingTime[] = "Security.JSONParser.ParsingTime";
-@@ -137,7 +138,7 @@ namespace base {
- std::optional<Value> JSONReader::Read(std::string_view json,
-                                       int options,
-                                       size_t max_depth) {
--#if BUILDFLAG(IS_NACL)
-+#if (BUILDFLAG(IS_NACL) || BUILDFLAG(IS_CEF_SANDBOX_BUILD))
-   internal::JSONParser parser(options, max_depth);
-   return parser.Parse(json);
- #else   // BUILDFLAG(IS_NACL)
-@@ -182,7 +183,7 @@ std::optional<Value::List> JSONReader::ReadList(std::string_view json,
- JSONReader::Result JSONReader::ReadAndReturnValueWithError(
-     std::string_view json,
-     int options) {
--#if BUILDFLAG(IS_NACL)
-+#if (BUILDFLAG(IS_NACL) || BUILDFLAG(IS_CEF_SANDBOX_BUILD))
-   internal::JSONParser parser(options);
-   auto value = parser.Parse(json);
-   if (!value) {
-@@ -223,7 +224,7 @@ bool JSONReader::UsingRust() {
-   if (!base::FeatureList::GetInstance()) {
-     return false;
-   }
--#if BUILDFLAG(IS_NACL)
-+#if (BUILDFLAG(IS_NACL) || BUILDFLAG(IS_CEF_SANDBOX_BUILD))
-   return false;
- #else
-   return base::FeatureList::IsEnabled(base::features::kUseRustJsonParser);
-diff --git base/logging.cc base/logging.cc
-index 26ba1a286e451..99b2ce6feb274 100644
---- base/logging.cc
-+++ base/logging.cc
-@@ -51,6 +51,7 @@
- #include "base/trace_event/base_tracing.h"
- #include "base/vlog.h"
- #include "build/build_config.h"
-+#include "cef/libcef/features/features.h"
- #include "third_party/abseil-cpp/absl/base/internal/raw_logging.h"
- #include "third_party/abseil-cpp/absl/cleanup/cleanup.h"
- 
-@@ -530,7 +531,7 @@ bool BaseInitLoggingImpl(const LoggingSettings& settings) {
-   }
- #endif
- 
--#if !BUILDFLAG(IS_NACL)
-+#if !BUILDFLAG(IS_NACL) && !BUILDFLAG(IS_CEF_SANDBOX_BUILD)
-   // Connects Rust logging with the //base logging functionality.
-   internal::init_rust_log_crate();
- #endif
-diff --git base/metrics/crc32.cc base/metrics/crc32.cc
-index 83e3cee2579ab..8238767ab9126 100644
---- base/metrics/crc32.cc
-+++ base/metrics/crc32.cc
-@@ -3,14 +3,15 @@
- // found in the LICENSE file.
- 
- #include "base/metrics/crc32.h"
-+#include "cef/libcef/features/features.h"
- 
--#if !BUILDFLAG(IS_NACL)
-+#if !BUILDFLAG(IS_NACL) && !BUILDFLAG(IS_CEF_SANDBOX_BUILD)
- #include "third_party/zlib/zlib.h"
- #endif  // !BUILDFLAG(IS_NACL)
- 
- namespace base {
- 
--#if !BUILDFLAG(IS_NACL)
-+#if !BUILDFLAG(IS_NACL) && !BUILDFLAG(IS_CEF_SANDBOX_BUILD)
- uint32_t Crc32(uint32_t sum, span<const uint8_t> data) {
-   if (data.empty()) {
-     return sum;
-diff --git base/process/memory.h base/process/memory.h
-index 5d11d4a1560b1..242a93bcca8ed 100644
---- base/process/memory.h
-+++ base/process/memory.h
-@@ -29,7 +29,7 @@ BASE_EXPORT void EnableTerminationOnOutOfMemory();
- #if PA_BUILDFLAG(USE_PARTITION_ALLOC)
- using partition_alloc::TerminateBecauseOutOfMemory;
- #else
--inline void TerminateBecauseOutOfMemory(size_t) {
-+[[noreturn]] inline void TerminateBecauseOutOfMemory(size_t) {
-   logging::RawCheckFailure("Out of memory");
- }
- #endif
-@@ -58,7 +58,11 @@ bool ReleaseAddressSpaceReservation();
- #if BUILDFLAG(IS_WIN)
- namespace win {
- 
-+#if PA_BUILDFLAG(USE_PARTITION_ALLOC)
- using partition_alloc::win::kOomExceptionCode;
-+#else
-+const DWORD kOomExceptionCode = 0xe0000008;
-+#endif
- 
- }  // namespace win
- #endif
-diff --git base/rand_util.h base/rand_util.h
-index d650943a7b75a..abd5217f8ceed 100644
---- base/rand_util.h
-+++ base/rand_util.h
-@@ -23,8 +23,9 @@
- #include "base/numerics/safe_conversions.h"
- #include "base/time/time.h"
- #include "build/build_config.h"
-+#include "cef/libcef/features/features.h"
- 
--#if !BUILDFLAG(IS_NACL)
-+#if !BUILDFLAG(IS_NACL) && !BUILDFLAG(IS_CEF_SANDBOX_BUILD)
- #include "third_party/boringssl/src/include/openssl/rand.h"
- #endif
- 
-@@ -189,7 +190,7 @@ class RandomBitGenerator {
-   ~RandomBitGenerator() = default;
- };
- 
--#if !BUILDFLAG(IS_NACL)
-+#if !BUILDFLAG(IS_NACL) && !BUILDFLAG(IS_CEF_SANDBOX_BUILD)
- class NonAllocatingRandomBitGenerator {
-  public:
-   using result_type = uint64_t;
-diff --git base/rand_util_win.cc base/rand_util_win.cc
-index 0b772cbae8916..b19183b34d176 100644
---- base/rand_util_win.cc
-+++ base/rand_util_win.cc
-@@ -15,7 +15,11 @@
- 
- #include "base/check.h"
- #include "base/feature_list.h"
-+#include "cef/libcef/features/features.h"
-+
-+#if !BUILDFLAG(IS_CEF_SANDBOX_BUILD)
- #include "third_party/boringssl/src/include/openssl/rand.h"
-+#endif
- 
- // Prototype for ProcessPrng.
- // See: https://learn.microsoft.com/en-us/windows/win32/seccng/processprng
-@@ -27,6 +31,7 @@ namespace base {
- 
- namespace internal {
- 
-+#if !BUILDFLAG(IS_CEF_SANDBOX_BUILD)
- namespace {
- 
- // The BoringSSl helpers are duplicated in rand_util_fuchsia.cc and
-@@ -48,6 +53,10 @@ bool UseBoringSSLForRandBytes() {
-   return g_use_boringssl.load(std::memory_order_relaxed);
- }
- 
-+#else  // !BUILDFLAG(IS_CEF_SANDBOX_BUILD)
-+void ConfigureBoringSSLBackedRandBytesFieldTrial() {}
-+#endif
-+
- }  // namespace internal
- 
- namespace {
-@@ -65,11 +74,13 @@ decltype(&ProcessPrng) GetProcessPrng() {
- }
- 
- void RandBytesInternal(span<uint8_t> output, bool avoid_allocation) {
-+#if !BUILDFLAG(IS_CEF_SANDBOX_BUILD)
-   if (!avoid_allocation && internal::UseBoringSSLForRandBytes()) {
-     // BoringSSL's RAND_bytes always returns 1. Any error aborts the program.
-     (void)RAND_bytes(output.data(), output.size());
-     return;
-   }
-+#endif  // !BUILDFLAG(IS_CEF_SANDBOX_BUILD)
- 
-   static decltype(&ProcessPrng) process_prng_fn = GetProcessPrng();
-   BOOL success =
-diff --git base/unguessable_token.cc base/unguessable_token.cc
-index ea33ca66f384c..33f4cc76f76bd 100644
---- base/unguessable_token.cc
-+++ base/unguessable_token.cc
-@@ -11,8 +11,9 @@
- #include "base/format_macros.h"
- #include "base/rand_util.h"
- #include "build/build_config.h"
-+#include "cef/libcef/features/features.h"
- 
--#if !BUILDFLAG(IS_NACL)
-+#if !BUILDFLAG(IS_NACL) && !BUILDFLAG(IS_CEF_SANDBOX_BUILD)
- #include "third_party/boringssl/src/include/openssl/mem.h"
- #endif
- 
-@@ -58,7 +59,7 @@ std::optional<UnguessableToken> UnguessableToken::DeserializeFromString(
- }
- 
- bool operator==(const UnguessableToken& lhs, const UnguessableToken& rhs) {
--#if BUILDFLAG(IS_NACL)
-+#if BUILDFLAG(IS_NACL) || BUILDFLAG(IS_CEF_SANDBOX_BUILD)
-   // BoringSSL is unavailable for NaCl builds so it remains timing dependent.
-   return lhs.token_ == rhs.token_;
- #else
-diff --git build_overrides/dawn.gni build_overrides/dawn.gni
-index cec3df3e50b6e..309b4e6a4fe0d 100644
---- build_overrides/dawn.gni
-+++ build_overrides/dawn.gni
-@@ -2,11 +2,15 @@
- # Use of this source code is governed by a BSD-style license that can be
- # found in the LICENSE file.
- 
-+import("//base/allocator/partition_allocator/partition_alloc.gni")
-+
- # The paths to Dawn's dependencies
- dawn_angle_dir = "//third_party/angle"
- dawn_glfw_dir = "//third_party/dawn/third_party/glfw"
- dawn_googletest_dir = "//third_party/googletest/src"
--dawn_partition_alloc_dir = "//base/allocator/partition_allocator"
-+if (use_partition_alloc) {
-+  dawn_partition_alloc_dir = "//base/allocator/partition_allocator"
-+}
- dawn_jinja2_dir = "//third_party/jinja2"
- dawn_jsoncpp_dir = "//third_party/jsoncpp"
- dawn_spirv_tools_dir = "//third_party/spirv-tools/src"