ui: Use base::MessageLoop.

ui/aura/root_window_host_x11.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_AURA_ROOT_WINDOW_HOST_X11_H_
 #define UI_AURA_ROOT_WINDOW_HOST_X11_H_
 
 #include <X11/Xlib.h>
 
 #include <vector>
@@ skipping 14 matching lines @@
 class MouseEvent;
 }
 
 namespace aura {
 
 namespace internal {
 class TouchEventCalibrate;
 }
 
 class RootWindowHostX11 : public RootWindowHost,
-                            public MessageLoop::Dispatcher,
-                            public EnvObserver {
+                          public base::MessageLoop::Dispatcher,
+                          public EnvObserver {
  public:
   explicit RootWindowHostX11(const gfx::Rect& bounds);
   virtual ~RootWindowHostX11();
 
   // Overridden from Dispatcher overrides:
   virtual bool Dispatch(const base::NativeEvent& event) OVERRIDE;
 
   // RootWindowHost Overrides.
   virtual void SetDelegate(RootWindowHostDelegate* delegate) OVERRIDE;
   virtual RootWindow* GetRootWindow() OVERRIDE;
@@ skipping 95 matching lines @@
   scoped_ptr<MouseMoveFilter> mouse_move_filter_;
 
   ui::X11AtomCache atom_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindowHostX11);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_HOST_X11_H_