Moved the AppNotification system into extensions namespace

chrome/browser/extensions/app_notify_channel_ui_android.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_APP_NOTIFY_CHANNEL_UI_ANDROID_H_
 #define CHROME_BROWSER_EXTENSIONS_APP_NOTIFY_CHANNEL_UI_ANDROID_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/extensions/app_notify_channel_ui.h"
 
+namespace extensions {
+
 class AppNotifyChannelUIAndroid : public AppNotifyChannelUI {
  public:
   AppNotifyChannelUIAndroid();
   virtual ~AppNotifyChannelUIAndroid();
 
   // AppNotifyChannelUI.
   virtual void PromptSyncSetup(AppNotifyChannelUI::Delegate* delegate) OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(AppNotifyChannelUIAndroid);
 };
 
+}  // namespace extensions
+
 #endif  // CHROME_BROWSER_EXTENSIONS_APP_NOTIFY_CHANNEL_UI_ANDROID_H_