Rename the aura_shell namespace to ash

ash/wm/toplevel_frame_view.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_FRAME_VIEW_H_
 #define ASH_WM_TOPLEVEL_FRAME_VIEW_H_
 #pragma once
 
 #include "ash/ash_export.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/window/non_client_view.h"
 
-namespace aura_shell {
+namespace ash {
 namespace internal {
 
 class FrameComponent;
 class SizingBorder;
 class WindowCaption;
 
 // A NonClientFrameView implementation for generic top-level windows in Aura.
 // TODO(beng): Find a way to automatically this for all top-level windows in
 //             Aura. Right now windows have to override CreateNonClientFrameView
 //             on WidgetDelegate to specify this.
@@ skipping 49 matching lines @@
 
   WindowCaption* caption_;
   SizingBorder* left_edge_;
   SizingBorder* right_edge_;
   SizingBorder* bottom_edge_;
 
   DISALLOW_COPY_AND_ASSIGN(ToplevelFrameView);
 };
 
 }  // namespace internal
-}  // namespace aura_shell
+}  // namespace ash
 
 #endif  // #ifndef ASH_WM_TOPLEVEL_FRAME_VIEW_H_