diff --git a/libcef/browser_impl.cc b/libcef/browser_impl.cc
index 67632c4fb..49b523203 100644
--- a/libcef/browser_impl.cc
+++ b/libcef/browser_impl.cc
@@ -180,9 +180,6 @@ CefBrowserImpl::CefBrowserImpl(const CefWindowInfo& windowInfo,
   popup_delegate_.reset(new BrowserWebViewDelegate(this));
   nav_controller_.reset(new BrowserNavigationController(this));
 
-  request_context_proxy_ =
-      new BrowserRequestContextProxy(_Context->request_context(), this);
-
   if (!file_system_root_.CreateUniqueTempDir()) {
     LOG(WARNING) << "Failed to create a temp dir for the filesystem."
                     "FileSystem feature will be disabled.";
@@ -791,7 +788,10 @@ void CefBrowserImpl::UIT_DestroyBrowser() {
   UIT_ClearMainWndHandle();
 
   main_frame_ = NULL;
-  request_context_proxy_ = NULL;
+
+  // Release the proxy on the IO thread.
+  CefThread::ReleaseSoon(CefThread::IO, FROM_HERE,
+      request_context_proxy_.release());
 
   // Remove the reference added in UIT_CreateBrowser().
   Release();
@@ -1591,6 +1591,16 @@ GURL CefBrowserImpl::pending_url() {
   return pending_url_;
 }
 
+net::URLRequestContext* CefBrowserImpl::request_context_proxy() {
+  DCHECK(CefThread::CurrentlyOn(CefThread::IO));
+
+  if (!request_context_proxy_) {
+    request_context_proxy_ =
+        new BrowserRequestContextProxy(_Context->request_context(), this);
+  }
+  return request_context_proxy_;
+}
+
 void CefBrowserImpl::UIT_CreateDevToolsClient(BrowserDevToolsAgent *agent) {
   dev_tools_client_.reset(new BrowserDevToolsClient(this, agent));
 }
diff --git a/libcef/browser_impl.h b/libcef/browser_impl.h
index ef643dd65..414fe078f 100644
--- a/libcef/browser_impl.h
+++ b/libcef/browser_impl.h
@@ -356,9 +356,7 @@ class CefBrowserImpl : public CefBrowser {
 
   void set_popup_rect(const gfx::Rect& rect) { popup_rect_ = rect; }
 
-  net::URLRequestContext* request_context_proxy() {
-    return request_context_proxy_;
-  }
+  net::URLRequestContext* request_context_proxy();
 
   static bool ImplementsThreadSafeReferenceCounting() { return true; }
 
diff --git a/libcef/browser_request_context_proxy.cc b/libcef/browser_request_context_proxy.cc
index 444464ab2..701ea9252 100644
--- a/libcef/browser_request_context_proxy.cc
+++ b/libcef/browser_request_context_proxy.cc
@@ -3,6 +3,7 @@
 // be found in the LICENSE file.
 
 #include "libcef/browser_request_context_proxy.h"
+#include "libcef/browser_impl.h"
 #include "libcef/browser_request_context.h"
 #include "libcef/cookie_store_proxy.h"
 
diff --git a/libcef/browser_request_context_proxy.h b/libcef/browser_request_context_proxy.h
index 4678b184a..efebbe4aa 100644
--- a/libcef/browser_request_context_proxy.h
+++ b/libcef/browser_request_context_proxy.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <string>
+#include "include/cef.h"
 #include "net/url_request/url_request_context.h"
 
 class BrowserRequestContext;
@@ -23,7 +24,7 @@ class BrowserRequestContextProxy : public net::URLRequestContext {
 
  private:
   BrowserRequestContext* context_;
-  CefBrowserImpl* browser_;
+  CefRefPtr<CefBrowserImpl> browser_;
 };
 
 #endif  // CEF_LIBCEF_BROWSER_REQUEST_CONTEXT_PROXY_H_
diff --git a/libcef/webwidget_host_win.cc b/libcef/webwidget_host_win.cc
index a8ec09157..92db81b66 100644
--- a/libcef/webwidget_host_win.cc
+++ b/libcef/webwidget_host_win.cc
@@ -353,11 +353,14 @@ WebWidgetHost::WebWidgetHost()
 }
 
 WebWidgetHost::~WebWidgetHost() {
-  if (view_)
-    ui::SetWindowUserData(view_, 0);
-
   TrackMouseLeave(false);
   ResetTooltip();
+
+  if (view_) {
+    ui::SetWindowUserData(view_, 0);
+    ui::SetWindowProc(view_, DefWindowProc);
+    view_ = NULL;
+  }
 }
 
 bool WebWidgetHost::WndProc(UINT message, WPARAM wparam, LPARAM lparam) {