Rename the aura_shell namespace to ash

ash/test/test_shell_delegate.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/test/test_shell_delegate.h"
 
-namespace aura_shell {
+namespace ash {
 namespace test {
 
 TestShellDelegate::TestShellDelegate() {
 }
 
 TestShellDelegate::~TestShellDelegate() {
 }
 
 void TestShellDelegate::CreateNewWindow() {
 }
@@ skipping 15 matching lines @@
 }
 
 void TestShellDelegate::LauncherItemClicked(const LauncherItem& item) {
 }
 
 bool TestShellDelegate::ConfigureLauncherItem(LauncherItem* item) {
   return true;
 }
 
 }  // namespace test
-}  // namespace aura_shell
+}  // namespace ash