MD Settings: Hook up about_page to new LifetimeBrowserProxy.

chrome/browser/ui/webui/settings/about_handler.h

 // Copyright 2016 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_SETTINGS_ABOUT_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_ABOUT_HANDLER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 63 matching lines @@
   // update status. On other platforms, it will request and perform an update
   // (if one is available).
   void HandleRefreshUpdateStatus(const base::ListValue* args);
   void RefreshUpdateStatus();
 
 #if defined(OS_MACOSX)
   // Promotes the updater for all users.
   void PromoteUpdater(const base::ListValue* args);
 #endif
 
-  // Relaunches the browser. |args| must be empty.
-  void HandleRelaunchNow(const base::ListValue* args);
-
   // Opens the feedback dialog. |args| must be empty.
   void HandleOpenFeedbackDialog(const base::ListValue* args);
 
   // Opens the help page. |args| must be empty.
   void HandleOpenHelpPage(const base::ListValue* args);
 
 #if defined(OS_CHROMEOS)
   // Sets the release track version.
   void HandleSetChannel(const base::ListValue* args);
 
@@ skipping 51 matching lines @@
 
   // Used for callbacks.
   base::WeakPtrFactory<AboutHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AboutHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_ABOUT_HANDLER_H_