Receive all messages in PluginObserver from the RenderFrameHost.

chrome/browser/plugins/plugin_observer.h

 // Copyright (c) 2012 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 CHROME_BROWSER_PLUGINS_PLUGIN_OBSERVER_H_
 #define CHROME_BROWSER_PLUGINS_PLUGIN_OBSERVER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/web_contents_observer.h"
@@ skipping 24 matching lines @@
                        public content::WebContentsUserData<PluginObserver> {
  public:
   ~PluginObserver() override;
 
   // content::WebContentsObserver implementation.
   void RenderFrameCreated(content::RenderFrameHost* render_frame_host) override;
   void PluginCrashed(const base::FilePath& plugin_path,
                      base::ProcessId plugin_pid) override;
   bool OnMessageReceived(const IPC::Message& message,
                          content::RenderFrameHost* render_frame_host) override;
-  bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
   explicit PluginObserver(content::WebContents* web_contents);
   friend class content::WebContentsUserData<PluginObserver>;
 
   class PluginPlaceholderHost;
 
   // Message handlers:
   void OnBlockedUnauthorizedPlugin(const base::string16& name,
                                    const std::string& identifier);
@@ skipping 10 matching lines @@
   // Stores all PluginPlaceholderHosts, keyed by their routing ID.
   std::map<int, PluginPlaceholderHost*> plugin_placeholders_;
 #endif
 
   base::WeakPtrFactory<PluginObserver> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginObserver);
 };
 
 #endif  // CHROME_BROWSER_PLUGINS_PLUGIN_OBSERVER_H_