Rename the aura_shell namespace to ash

ash/launcher/app_launcher_button.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/launcher/app_launcher_button.h"
 
 #include <algorithm>
 
 #include "ash/launcher/launcher_button_host.h"
 #include "ui/gfx/canvas_skia.h"
 
-namespace aura_shell {
+namespace ash {
 
 namespace internal {
 
 const int kImageSize = 32;
 
 AppLauncherButton::AppLauncherButton(views::ButtonListener* listener,
                                      LauncherButtonHost* host)
     : views::ImageButton(listener),
       host_(host) {
   SetPreferredSize(gfx::Size(kImageSize, kImageSize));
@@ skipping 47 matching lines @@
   ImageButton::OnMouseCaptureLost();
 }
 
 bool AppLauncherButton::OnMouseDragged(const views::MouseEvent& event) {
   ImageButton::OnMouseDragged(event);
   host_->MouseDraggedOnButton(this, event);
   return true;
 }
 
 }  // namespace internal
-}  // namespace aura_shell
+}  // namespace ash