ui: Use base::MessageLoop.

ui/views/win/hwnd_message_handler.h

Index: ui/views/win/hwnd_message_handler.h
diff --git a/ui/views/win/hwnd_message_handler.h b/ui/views/win/hwnd_message_handler.h
index e455baa798eeebb1a34db29db551bab13b691d87..567e32ff2c0843e302883c59f185b1a7930ab097 100644
--- a/ui/views/win/hwnd_message_handler.h
+++ b/ui/views/win/hwnd_message_handler.h
@@ -55,9 +55,10 @@ const int WM_NCUAHDRAWFRAME = 0xAF;
 // used by both a views::NativeWidget and an aura::RootWindowHost
 // implementation.
 // TODO(beng): This object should eventually *become* the WindowImpl.
-class VIEWS_EXPORT HWNDMessageHandler : public ui::WindowImpl,
-                                        public internal::InputMethodDelegate,
-                                        public MessageLoopForUI::Observer {
+class VIEWS_EXPORT HWNDMessageHandler :
+    public ui::WindowImpl,
+    public internal::InputMethodDelegate,
+    public base::MessageLoopForUI::Observer {
  public:
   explicit HWNDMessageHandler(HWNDMessageHandlerDelegate* delegate);
   ~HWNDMessageHandler();