Rename the aura_shell namespace to ash

ash/wm/always_on_top_controller.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/always_on_top_controller.h"
 
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window.h"
 
-namespace aura_shell {
+namespace ash {
 namespace internal {
 
 AlwaysOnTopController::AlwaysOnTopController()
     : default_container_(NULL),
       always_on_top_container_(NULL) {
 }
 
 AlwaysOnTopController::~AlwaysOnTopController() {
   if (default_container_)
     default_container_->RemoveObserver(this);
@@ skipping 48 matching lines @@
 }
 
 void AlwaysOnTopController::OnWindowDestroyed(aura::Window* window) {
   if (window == default_container_)
     default_container_ = NULL;
   if (window == always_on_top_container_)
     always_on_top_container_ = NULL;
 }
 
 }  // namespace internal
-}  // namespace aura_shell
+}  // namespace ash