Remove remaining use of the deprecated MessageLoopProxy

win8/metro_driver/chrome_app_view.h

Index: win8/metro_driver/chrome_app_view.h
diff --git a/win8/metro_driver/chrome_app_view.h b/win8/metro_driver/chrome_app_view.h
index 77d67815924bf098ae5d826ddd5ce86e7e89c6c5..2620d008bd09970b876bdd708b117f0b8ddc505f 100644
--- a/win8/metro_driver/chrome_app_view.h
+++ b/win8/metro_driver/chrome_app_view.h
@@ -162,7 +162,7 @@ struct Globals {
   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;
 };