Remove remaining use of the deprecated MessageLoopProxy

win8/metro_driver/chrome_app_view.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 WIN8_METRO_DRIVER_CHROME_APP_VIEW_H_
 #define WIN8_METRO_DRIVER_CHROME_APP_VIEW_H_
 
 #include <windows.applicationmodel.core.h>
 #include <windows.ui.core.h>
 #include <windows.ui.input.h>
@@ skipping 144 matching lines @@
   HANDLE host_thread;
   ChromeAppView* view;
   WNDPROC g_core_proc;
   base::string16 navigation_url;
   base::string16 search_string;
   winapp::Activation::ApplicationExecutionState previous_state;
   winapp::Activation::ActivationKind initial_activation_kind;
   bool is_initial_activation;
   // This message loop lives in the app view's thread. Some operations have
   // to be initiated from that thread, notably spawning file pickers.
-  base::MessageLoopProxy* appview_msg_loop;
+  base::SingleThreadTaskRunner* appview_task_runner;
   winapp::Core::ICoreApplicationExit* app_exit;
   base::string16 metro_command_line_switches;
 };
 
 extern Globals globals;
 
 #endif  // WIN8_METRO_DRIVER_CHROME_APP_VIEW_H_