Cleanup: Remove VersionUpdater::RelaunchBrowser interface method.

chrome/browser/ui/webui/help/version_updater.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_UI_WEBUI_HELP_VERSION_UPDATER_H_
 #define CHROME_BROWSER_UI_WEBUI_HELP_VERSION_UPDATER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 55 matching lines @@
   // (which is only used on the Mac) can be used to show or hide the promote UI
   // elements.
   virtual void CheckForUpdate(const StatusCallback& status_callback,
                               const PromoteCallback& promote_callback) = 0;
 
 #if defined(OS_MACOSX)
   // Make updates available for all users.
   virtual void PromoteUpdater() const = 0;
 #endif
 
-  // Relaunches the browser, generally after being updated.
-  virtual void RelaunchBrowser() const = 0;
-
 #if defined(OS_CHROMEOS)
   virtual void SetChannel(const std::string& channel,
                           bool is_powerwash_allowed) = 0;
   virtual void GetChannel(bool get_current_channel,
                           const ChannelCallback& callback) = 0;
 #endif
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_HELP_VERSION_UPDATER_H_