Use a direct include of the message_loop header in ui/, part 2.

ui/views/widget/desktop_aura/x11_desktop_handler.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 UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_
 
 #include <X11/Xlib.h>
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
 #undef RootWindow
 
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "ui/aura/env_observer.h"
 #include "ui/base/x/x11_atom_cache.h"
 #include "ui/views/views_export.h"
 
 template <typename T> struct DefaultSingletonTraits;
 
 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
@@ skipping 34 matching lines @@
   ::Window current_window_;
 
   ui::X11AtomCache atom_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(X11DesktopHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_