Rename the aura_shell namespace to ash

ash/wm/toplevel_window_event_filter.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_WINDOW_EVENT_FILTER_H_
 #define ASH_WM_TOPLEVEL_WINDOW_EVENT_FILTER_H_
 #pragma once
 
 #include <set>
 
 #include "base/compiler_specific.h"
 #include "ui/aura/event_filter.h"
 #include "ash/ash_export.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
 
 namespace aura {
 class LocatedEvent;
 class MouseEvent;
 class Window;
 }
 
-namespace aura_shell {
+namespace ash {
 
 class ASH_EXPORT ToplevelWindowEventFilter : public aura::EventFilter {
  public:
   explicit ToplevelWindowEventFilter(aura::Window* owner);
   virtual ~ToplevelWindowEventFilter();
 
   // Overridden from aura::EventFilter:
   virtual bool PreHandleKeyEvent(aura::Window* target,
                                  aura::KeyEvent* event) OVERRIDE;
   virtual bool PreHandleMouseEvent(aura::Window* target,
@@ skipping 62 matching lines @@
 
   // Set of touch ids currently pressed.
   std::set<int> pressed_touch_ids_;
 
   DISALLOW_COPY_AND_ASSIGN(ToplevelWindowEventFilter);
 };
 
 }  // namespace aura
 
 #endif  // ASH_WM_TOPLEVEL_WINDOW_EVENT_FILTER_H_