Fix message routing for BrowserPlugin in iframe

extensions/renderer/guest_view/guest_view_container.h

 // Copyright 2014 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 EXTENSIONS_RENDERER_GUEST_VIEW_GUEST_VIEW_CONTAINER_H_
 #define EXTENSIONS_RENDERER_GUEST_VIEW_GUEST_VIEW_CONTAINER_H_
 
 #include "content/public/renderer/browser_plugin_delegate.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "ipc/ipc_message.h"
 
 namespace extensions {
 
-class GuestViewContainer : public content::BrowserPluginDelegate,
-                           public content::RenderFrameObserver {
+class GuestViewContainer : public content::BrowserPluginDelegate {
  public:
   explicit GuestViewContainer(content::RenderFrame* render_frame);
   ~GuestViewContainer() override;
 
+  // Queries whether GuestViewContainer is interested in the |message|.
+  static bool HandlesMessage(const IPC::Message& message);
+
   // BrowserPluginDelegate implementation.
   void SetElementInstanceID(int element_instance_id) override;
 
-  // RenderFrameObserver override.
-  void OnDestruct() override;
-  bool OnMessageReceived(const IPC::Message& message) override;
-
-  virtual bool HandlesMessage(const IPC::Message& message) = 0;
-  virtual bool OnMessage(const IPC::Message& message) = 0;
-
   int element_instance_id() const { return element_instance_id_; }
   int render_view_routing_id() const { return render_view_routing_id_; }
+  content::RenderFrame* render_frame() const { return render_frame_; }
 
  private:
   int element_instance_id_;
-  int render_view_routing_id_;
+  const int render_view_routing_id_;
+  content::RenderFrame* const render_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(GuestViewContainer);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_GUEST_VIEW_GUEST_VIEW_CONTAINER_H_