Rename the aura_shell namespace to ash

ash/wm/root_window_event_filter.cc

 // 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.
 
 #include "ash/wm/root_window_event_filter.h"
 
 #include "ash/shell.h"
 #include "ash/wm/activation_controller.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/event.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/base/hit_test.h"
 
-namespace aura_shell {
+namespace ash {
 namespace internal {
 
 // Returns the default cursor for a window component.
 gfx::NativeCursor CursorForWindowComponent(int window_component) {
   switch (window_component) {
     case HTBOTTOM:
       return aura::kCursorSouthResize;
     case HTBOTTOMLEFT:
       return aura::kCursorSouthWestResize;
     case HTBOTTOMRIGHT:
@@ skipping 131 matching lines @@
     aura::EventFilter* filter;
     while (status == ui::TOUCH_STATUS_UNKNOWN &&
         (filter = it.GetNext()) != NULL) {
       status = filter->PreHandleTouchEvent(target, event);
     }
   }
   return status;
 }
 
 }  // namespace internal
-}  // namespace aura_shell
+}  // namespace ash