Rename the aura_shell namespace to ash

ash/wm/modal_container_layout_manager.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_WM_MODAL_CONTAINER_LAYOUT_MANAGER_H_
 #define ASH_WM_MODAL_CONTAINER_LAYOUT_MANAGER_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 10 matching lines @@
 class Window;
 class EventFilter;
 }
 namespace gfx {
 class Rect;
 }
 namespace views {
 class Widget;
 }
 
-namespace aura_shell {
+namespace ash {
 namespace internal {
 
 // LayoutManager for the modal window container.
 class ASH_EXPORT ModalContainerLayoutManager
     : public aura::LayoutManager,
       public aura::WindowObserver,
       public ui::LayerAnimationObserver,
       public ModalityEventFilterDelegate {
  public:
   explicit ModalContainerLayoutManager(aura::Window* container);
@@ skipping 48 matching lines @@
 
   // An event filter that enforces the modality of the topmost window in
   // |modal_windows_|. The event filter is attached when a modal window is
   // added, and removed when the last is closed.
   scoped_ptr<aura::EventFilter> modality_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(ModalContainerLayoutManager);
 };
 
 }  // namespace internal
-}  // namespace aura_shell
+}  // namespace ash
 
 #endif  // ASH_WM_MODAL_CONTAINER_LAYOUT_MANAGER_H_