- Make sure BrowserRequestContextProxy is only used on the IO thread (issue #542).

- Windows: Reset the window procedure in the WebWidgetHost destructor to avoid crashes if messages are delivered after the window is destroyed.
- Add thread-related DCHECKS in browser_resource_loader_bridge.cc.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@650 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

cef1/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_.reset(
-      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.";
@@ -785,7 +782,10 @@ void CefBrowserImpl::UIT_DestroyBrowser() {
   UIT_ClearMainWndHandle();
 
   main_frame_ = NULL;
-  request_context_proxy_.reset(NULL);
+
+  // Delete the proxy on the IO thread.
+  CefThread::DeleteSoon(CefThread::IO, FROM_HERE,
+      request_context_proxy_.release());
 
   // Remove the reference added in UIT_CreateBrowser().
   Release();
@@ -1585,6 +1585,16 @@ GURL CefBrowserImpl::pending_url() {
   return pending_url_;
 }
 
+net::URLRequestContext* CefBrowserImpl::request_context_proxy() {
+  DCHECK(CefThread::CurrentlyOn(CefThread::IO));
+
+  if (!request_context_proxy_.get()) {
+    request_context_proxy_.reset(
+        new BrowserRequestContextProxy(_Context->request_context(), this));
+  }
+  return request_context_proxy_.get();
+}
+
 void CefBrowserImpl::UIT_CreateDevToolsClient(BrowserDevToolsAgent *agent) {
   dev_tools_client_.reset(new BrowserDevToolsClient(this, agent));
 }