chromeos: Move files in //ash/common to //ash, part 2

ash/wm/mru_window_tracker.h

 // Copyright 2013 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_MRU_WINDOW_TRACKER_H_
-#define ASH_COMMON_WM_MRU_WINDOW_TRACKER_H_
+#ifndef ASH_WM_MRU_WINDOW_TRACKER_H_
+#define ASH_WM_MRU_WINDOW_TRACKER_H_
 
 #include <list>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "ash/common/wm_activation_observer.h"
 #include "base/macros.h"
 #include "ui/aura/window_observer.h"
 
 namespace ash {
@@ skipping 41 matching lines @@
   // through, sorted by most recently used.
   std::list<WmWindow*> mru_windows_;
 
   bool ignore_window_activations_;
 
   DISALLOW_COPY_AND_ASSIGN(MruWindowTracker);
 };
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_WM_MRU_WINDOW_TRACKER_H_
+#endif  // ASH_WM_MRU_WINDOW_TRACKER_H_