ui: Use base::MessageLoop.

ui/views/widget/desktop_aura/x11_desktop_handler.h

Index: ui/views/widget/desktop_aura/x11_desktop_handler.h
diff --git a/ui/views/widget/desktop_aura/x11_desktop_handler.h b/ui/views/widget/desktop_aura/x11_desktop_handler.h
index 151c7ae3c50ce57b3e281bd0edd0f403f1463725..2415377eada1d7bc99030c6d98579103f71a35cd 100644
--- a/ui/views/widget/desktop_aura/x11_desktop_handler.h
+++ b/ui/views/widget/desktop_aura/x11_desktop_handler.h
@@ -21,9 +21,8 @@ namespace views {
 // A singleton that owns global objects related to the desktop and listens for
 // X11 events on the X11 root window. Destroys itself when aura::Env is
 // deleted.
-class VIEWS_EXPORT X11DesktopHandler
-    : public MessageLoop::Dispatcher,
-      public aura::EnvObserver {
+class VIEWS_EXPORT X11DesktopHandler : public base::MessageLoop::Dispatcher,
+                                       public aura::EnvObserver {
  public:
   // Returns the singleton handler.
   static X11DesktopHandler* get();