Add the "virtual" keyword on method overrides that are missing it.

chrome/plugin/plugin_channel.h

 // Copyright (c) 2010 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_PLUGIN_PLUGIN_CHANNEL_H_
 #define CHROME_PLUGIN_PLUGIN_CHANNEL_H_
 #pragma once
 
 #include <vector>
 #include "base/ref_counted.h"
@@ skipping 12 matching lines @@
  public:
   // Get a new PluginChannel object for the current process to talk to the
   // given renderer process. The renderer ID is an opaque unique ID generated
   // by the browser.
   static PluginChannel* GetPluginChannel(int renderer_id,
                                          MessageLoop* ipc_message_loop);
 
   // Send a message to all renderers that the process is going to shutdown.
   static void NotifyRenderersOfPendingShutdown();
 
-  ~PluginChannel();
+  virtual ~PluginChannel();
 
   virtual bool Send(IPC::Message* msg);
   virtual void OnMessageReceived(const IPC::Message& message);
 
   base::ProcessHandle renderer_handle() const { return renderer_handle_; }
   int renderer_id() { return renderer_id_; }
 
-  int GenerateRouteID();
+  virtual int GenerateRouteID();
 
   // Returns the event that's set when a call to the renderer causes a modal
   // dialog to come up.
   base::WaitableEvent* GetModalDialogEvent(gfx::NativeViewId containing_window);
 
   bool in_send() { return in_send_ != 0; }
 
   bool off_the_record() { return off_the_record_; }
   void set_off_the_record(bool value) { off_the_record_ = value; }
 
@@ skipping 10 matching lines @@
 
   // Overrides PluginChannelBase::Init.
   virtual bool Init(MessageLoop* ipc_message_loop, bool create_pipe_now);
 
  private:
   class MessageFilter;
 
   // Called on the plugin thread
   PluginChannel();
 
-  void OnControlMessageReceived(const IPC::Message& msg);
+  virtual void OnControlMessageReceived(const IPC::Message& msg);
 
   static PluginChannelBase* ClassFactory() { return new PluginChannel(); }
 
   void OnCreateInstance(const std::string& mime_type, int* instance_id);
   void OnDestroyInstance(int instance_id, IPC::Message* reply_msg);
   void OnGenerateRouteID(int* route_id);
   void OnClearSiteData(uint64 flags,
                        const std::string& domain,
                        base::Time begin_time);
 
@@ skipping 21 matching lines @@
 
   int in_send_;  // Tracks if we're in a Send call.
   bool log_messages_;  // True if we should log sent and received messages.
   bool off_the_record_; // True if the renderer is in off the record mode.
   scoped_refptr<MessageFilter> filter_;  // Handles the modal dialog events.
 
   DISALLOW_COPY_AND_ASSIGN(PluginChannel);
 };
 
 #endif  // CHROME_PLUGIN_PLUGIN_CHANNEL_H_