Shuffles and renames ash/common/wm classes

ash/common/wm_root_window_controller_observer.h

 // Copyright 2016 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_COMMON_WM_WM_ROOT_WINDOW_CONTROLLER_OBSERVER_H_
-#define ASH_COMMON_WM_WM_ROOT_WINDOW_CONTROLLER_OBSERVER_H_
+#ifndef ASH_COMMON_WM_ROOT_WINDOW_CONTROLLER_OBSERVER_H_
+#define ASH_COMMON_WM_ROOT_WINDOW_CONTROLLER_OBSERVER_H_
 
 #include "ash/ash_export.h"
 
 namespace ash {
-namespace wm {
 
 class WmWindow;
 
 class ASH_EXPORT WmRootWindowControllerObserver {
  public:
   virtual void OnWorkAreaChanged() {}
   virtual void OnFullscreenStateChanged(bool is_fullscreen) {}
   virtual void OnShelfAlignmentChanged() {}
 
  protected:
   virtual ~WmRootWindowControllerObserver() {}
 };
 
-}  // namespace wm
 }  // namespace ash
 
-#endif  // ASH_COMMON_WM_WM_ROOT_WINDOW_CONTROLLER_OBSERVER_H_
+#endif  // ASH_COMMON_WM_ROOT_WINDOW_CONTROLLER_OBSERVER_H_