Rename the aura_shell namespace to ash

ash/wm/root_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_ROOT_WINDOW_EVENT_FILTER_H_
 #define ASH_WM_ROOT_WINDOW_EVENT_FILTER_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/observer_list.h"
 #include "ui/aura/event.h"
 #include "ui/aura/event_filter.h"
 #include "ash/ash_export.h"
 
-namespace aura_shell {
+namespace ash {
 namespace internal {
 
 // RootWindowEventFilter gets all root window events first and can provide
 // actions to those events. It implements root window features such as click to
 // activate a window and cursor change when moving mouse.
 // Additional event filters can be added to RootWIndowEventFilter. Events will
 // pass through those additional filters in their addition order and could be
 // consumed by any of those filters. If an event is consumed by a filter, the
 // rest of the filter(s) and RootWindowEventFilter will not see the consumed
 // event.
@@ skipping 31 matching lines @@
   ui::TouchStatus FilterTouchEvent(aura::Window* target,
                                    aura::TouchEvent* event);
 
   // Additional event filters that pre-handles events.
   ObserverList<aura::EventFilter, true> filters_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindowEventFilter);
 };
 
 }  // namespace internal
-}  // namespace aura_shell
+}  // namespace ash
 
 #endif  // ASH_WM_ROOT_WINDOW_EVENT_FILTER_H_