[WebView] Remove onFailure from VisualStateCallback.

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index ca442d27367f9a9f528b4d49454b85457810d156..0f4b797e3a4d4dd46bab829fba0c38e38e385827 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -479,6 +479,7 @@ class CONTENT_EXPORT RenderFrameHostImpl
   void OnRenderProcessGone(int status, int error_code);
   void OnContextMenu(const ContextMenuParams& params);
   void OnJavaScriptExecuteResponse(int id, const base::ListValue& result);
+  void OnVisualStateSwapInfo(int source_frame_number, bool swap_success);
   void OnVisualStateResponse(uint64 id);
   void OnRunJavaScriptMessage(const base::string16& message,
                               const base::string16& default_prompt,
@@ -705,6 +706,8 @@ class CONTENT_EXPORT RenderFrameHostImpl
   // NOTE: This must be the last member.
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
 
+  std::pair<int, bool> last_swap_info_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };