Rename the aura_shell namespace to ash

ash/launcher/launcher_model.h

 // Copyright (c) 2011 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_LAUNCHER_LAUNCHER_MODEL_H_
 #define ASH_LAUNCHER_LAUNCHER_MODEL_H_
 #pragma once
 
 #include <vector>
 
 #include "ash/launcher/launcher_types.h"
 #include "base/observer_list.h"
 #include "ash/ash_export.h"
 
 namespace aura {
 class Window;
 }
 
-namespace aura_shell {
+namespace ash {
 
 class LauncherModelObserver;
 
 // Model used by LauncherView.
 class ASH_EXPORT LauncherModel {
  public:
   LauncherModel();
   ~LauncherModel();
 
   // Adds a new item to the model.
@@ skipping 25 matching lines @@
   void AddObserver(LauncherModelObserver* observer);
   void RemoveObserver(LauncherModelObserver* observer);
 
  private:
   LauncherItems items_;
   ObserverList<LauncherModelObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(LauncherModel);
 };
 
-}  // namespace aura_shell
+}  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_MODEL_H_