Rename the aura_shell namespace to ash

chrome/browser/chrome_browser_main_extra_parts_aura.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 "chrome/browser/chrome_browser_main_extra_parts_aura.h"
 
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/shell.h"
 #include "base/command_line.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 24 matching lines @@
     ui::gfx_test_utils::SetupTestCompositor();
 #endif
   }
 
 #if defined(OS_CHROMEOS)
   if (chromeos::system::runtime_environment::IsRunningOnChromeOS())
     aura::RootWindow::set_use_fullscreen_host_window(true);
 #endif
 
   // Shell takes ownership of ChromeShellDelegate.
-  aura_shell::Shell* aura_shell =
-      aura_shell::Shell::CreateInstance(new ChromeShellDelegate);
-  // accelerator controller takes ownership of ScreenshotDelegate.
-  aura_shell->accelerator_controller()->SetScreenshotDelegate(
-      new ScreenshotTaker);
+  ash::Shell* shell = ash::Shell::CreateInstance(new ChromeShellDelegate);
+  // AcceleratorController takes ownership of ScreenshotDelegate.
+  shell->accelerator_controller()->SetScreenshotDelegate(new ScreenshotTaker);
 
   // Make sure the singleton ScreenOrientationListener object is created.
   ScreenOrientationListener::GetInstance();
 }
 
 void ChromeBrowserMainExtraPartsAura::PostMainMessageLoopRun() {
-  aura_shell::Shell::DeleteInstance();
+  ash::Shell::DeleteInstance();
   aura::RootWindow::DeleteInstance();
 }