Fix OSK flickering issue

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 116 matching lines @@
 struct RequestNavigationParams;
 struct ResourceResponseHead;
 struct StartNavigationParams;
 struct StreamOverrideParameters;
 class VRDispatcher;
 
 class CONTENT_EXPORT RenderFrameImpl
     : public RenderFrame,
       NON_EXPORTED_BASE(public blink::WebFrameClient),
       NON_EXPORTED_BASE(public media::WebMediaPlayerDelegate),
-      NON_EXPORTED_BASE(public blink::WebPageSerializerClient) {
+      NON_EXPORTED_BASE(public blink::WebPageSerializerClient),
+      public base::SupportsWeakPtr<RenderFrameImpl> {
  public:
   // Creates a new RenderFrame as the main frame of |render_view|.
   static RenderFrameImpl* CreateMainFrame(RenderViewImpl* render_view,
                                           int32 routing_id);
 
   // Creates a new RenderFrame with |routing_id|.  If |proxy_routing_id| is
   // MSG_ROUTING_NONE, it creates the Blink WebLocalFrame and inserts it into
   // the frame tree after the frame identified by
   // |previous_sibling_routing_id|, or as the first child if
   // |previous_sibling_routing_id| is MSG_ROUTING_NONE. Otherwise, the frame is
@@ skipping 914 matching lines @@
 #endif
 
   base::WeakPtrFactory<RenderFrameImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_IMPL_H_