- 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/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) {