Fix renderer crashes when frame gets detached while injectng user scripts.

content/renderer/render_frame_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 #define CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 327 matching lines @@
  protected:
   RenderFrameImpl(RenderViewImpl* render_view, int32 routing_id);
 
  private:
   friend class RenderFrameObserver;
   FRIEND_TEST_ALL_PREFIXES(RenderFrameImplTest,
                            ShouldUpdateSelectionTextFromContextMenuParams);
 
   typedef std::map<GURL, double> HostZoomLevels;
 
+  // Function used to close frame asynchronously.
+  static void closeFrame(blink::WebFrame* frame);
+
   // Functions to add and remove observers for this object.
   void AddObserver(RenderFrameObserver* observer);
   void RemoveObserver(RenderFrameObserver* observer);
 
   void UpdateURL(blink::WebFrame* frame);
 
   // IPC message handlers ------------------------------------------------------
   //
   // The documentation for these functions should be in
   // content/common/*_messages.h for the message that the function is handling.
@@ skipping 47 matching lines @@
   // always respond properly to the request, so we don't have to worry so
   // much about leaks.
   IDMap<ContextMenuClient, IDMapExternalPointer> pending_context_menus_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_IMPL_H_