Move DisplayManager and DisplayChangeObserverX11 from aura to ash.

ash/display/display_change_observer_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_DISPLAY_CHANGE_OBSERVER_X11_H
-#define UI_AURA_DISPLAY_CHANGE_OBSERVER_X11_H
+#ifndef ASH_DISPLAY_DISPLAY_CHANGE_OBSERVER_X11_H
+#define ASH_DISPLAY_DISPLAY_CHANGE_OBSERVER_X11_H
 
 #include <X11/Xlib.h>
 
 // Xlib.h defines RootWindow.
 #undef RootWindow
 
 #include "base/basictypes.h"
 #include "base/message_loop.h"
 
-namespace aura {
+namespace ash {
 namespace internal {
 
 // An object that observes changes in display configuration and
 // update DisplayManagers.
 class DisplayChangeObserverX11 : public MessageLoop::Dispatcher {
  public:
   DisplayChangeObserverX11();
   virtual ~DisplayChangeObserverX11();
 
   // Overridden from Dispatcher overrides:
   virtual bool Dispatch(const base::NativeEvent& xev) OVERRIDE;
 
   // Reads display configurations from the system and notifies
   // |display_manager_| about the change.
   void NotifyDisplayChange();
 
  private:
   Display* xdisplay_;
 
   ::Window x_root_window_;
 
   int xrandr_event_base_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayChangeObserverX11);
 };
 
 }  // namespace internal
-}  // namespace aura
+}  // namespace ash
 
-#endif  // UI_AURA_DISPLAY_CHANGE_OBSERVER_X11_H
+#endif  // ASH_DISPLAY_AURA_DISPLAY_CHANGE_OBSERVER_X11_H