Rename the aura_shell namespace to ash

ash/wm/toplevel_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_TOPLEVEL_LAYOUT_MANAGER_H_
 #define ASH_WM_TOPLEVEL_LAYOUT_MANAGER_H_
 #pragma once
 
 #include <set>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/aura/layout_manager.h"
 #include "ui/aura/window_observer.h"
 #include "ash/ash_export.h"
 
-namespace aura_shell {
+namespace ash {
 namespace internal {
 
 class ShelfLayoutManager;
 
 // ToplevelLayoutManager is the LayoutManager installed on a container that
 // hosts what the shell considers to be top-level windows. It is used if the
 // WorkspaceManager is not enabled. ToplevelLayoutManager listens for changes to
 // kShowStateKey and resizes the window appropriately.
 class ASH_EXPORT ToplevelLayoutManager : public aura::LayoutManager,
                                                 public aura::WindowObserver {
@@ skipping 26 matching lines @@
 
   // Set of windows we're listening to.
   Windows windows_;
 
   // May be NULL if we're not using a shelf.
   ShelfLayoutManager* shelf_;
 
   DISALLOW_COPY_AND_ASSIGN(ToplevelLayoutManager);
 };
 
-}  // namespace aura_shell
+}  // namespace ash
 }  // namespace internal
 
 #endif  // ASH_WM_TOPLEVEL_LAYOUT_MANAGER_H_