Moves ShellObserver to ash/common

ash/utility/screenshot_controller.h

 // Copyright 2014 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 ASH_UTILITY_SCREENSHOT_CONTROLLER_H_
 #define ASH_UTILITY_SCREENSHOT_CONTROLLER_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 
 #include "ash/ash_export.h"
-#include "ash/shell_observer.h"
+#include "ash/common/shell_observer.h"
 #include "base/macros.h"
 #include "ui/aura/window_observer.h"
 #include "ui/display/display_observer.h"
 #include "ui/events/event_handler.h"
 #include "ui/gfx/geometry/point.h"
 
 namespace aura {
 class Window;
 }
 
@@ skipping 76 matching lines @@
 
   // ScreenshotDelegate to take the actual screenshot. No ownership.
   ScreenshotDelegate* screenshot_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenshotController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_UTILITY_SCREENSHOT_CONTROLLER_H_