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

chrome/service/service_utility_process_host.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_SERVICE_SERVICE_UTILITY_PROCESS_HOST_H_
 #define CHROME_SERVICE_SERVICE_UTILITY_PROCESS_HOST_H_
 #pragma once
 
 #include "build/build_config.h"
 
@@ skipping 89 matching lines @@
 
   // Overriden from ChildProcessHost.
   virtual bool CanShutdown() { return true; }
   virtual void OnChildDied();
 
  private:
   // Starts a process.  Returns true iff it succeeded.
   bool StartProcess(const FilePath& exposed_dir);
 
   // IPC messages:
-  void OnMessageReceived(const IPC::Message& message);
+  virtual void OnMessageReceived(const IPC::Message& message);
   // Called when at least one page in the specified PDF has been rendered
   // successfully into metafile_path_;
   void OnRenderPDFPagesToMetafileSucceeded(int highest_rendered_page_number);
   // Any other messages to be handled by the client.
   bool MessageForClient(const IPC::Message& message);
 
 #if defined(OS_WIN)  // This hack is Windows-specific.
   void OnPreCacheFont(LOGFONT font);
 #endif  // defined(OS_WIN)
 
   // A pointer to our client interface, who will be informed of progress.
   scoped_refptr<Client> client_;
   scoped_refptr<base::MessageLoopProxy> client_message_loop_proxy_;
   bool waiting_for_reply_;
   // The path to the temp file where the metafile will be written to.
   FilePath metafile_path_;
   // The temporary folder created for the metafile.
   scoped_ptr<ScopedTempDir> scratch_metafile_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceUtilityProcessHost);
 };
 
 #endif  // CHROME_SERVICE_SERVICE_UTILITY_PROCESS_HOST_H_