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

chrome/browser/browser_process_impl.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.
 
 // When each service is created, we set a flag indicating this. At this point,
 // the service initialization could fail or succeed. This allows us to remember
 // if we tried to create a service, and not try creating it over and over if
 // the creation failed.
 
 #ifndef CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_
@@ skipping 56 matching lines @@
   virtual GoogleURLTracker* google_url_tracker();
   virtual IntranetRedirectDetector* intranet_redirect_detector();
   virtual const std::string& GetApplicationLocale();
   virtual void SetApplicationLocale(const std::string& locale);
   virtual DownloadStatusUpdater* download_status_updater();
   virtual base::WaitableEvent* shutdown_event();
   virtual TabCloseableStateWatcher* tab_closeable_state_watcher();
   virtual void CheckForInspectorFiles();
 
 #if (defined(OS_WIN) || defined(OS_LINUX)) && !defined(OS_CHROMEOS)
-  void StartAutoupdateTimer();
+  virtual void StartAutoupdateTimer();
 #endif
 
   virtual bool have_inspector_files() const;
 
 #if defined(IPC_MESSAGE_LOG_ENABLED)
   virtual void SetIPCLoggingEnabled(bool enable);
 #endif
 
  private:
   void ClearLocalState(const FilePath& profile_path);
@@ skipping 134 matching lines @@
   // restarted, and if that's the case, restarts the browser.
   void OnAutoupdateTimer();
   bool CanAutorestartForUpdate() const;
   void RestartPersistentInstance();
 #endif  // defined(OS_WIN) || defined(OS_LINUX)
 
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessImpl);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_