Moved the AppNotification system into extensions namespace

chrome/browser/extensions/app_notification.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_NOTIFICATION_H_
 #define CHROME_BROWSER_EXTENSIONS_APP_NOTIFICATION_H_
 
 #include <string>
 #include <vector>
 
 #include "base/time.h"
 #include "base/memory/linked_ptr.h"
 #include "base/values.h"
 #include "googleurl/src/gurl.h"
 
+namespace extensions {
+
 // This class is used to represent a notification for an installed app, to be
 // displayed on the New Tab Page.
 class AppNotification {
  public:
   // Creates an instance with the given properties.
   // If |is_local| is true, notification is not synced.
   // If |guid| is empty, a new guid is automatically created.
   AppNotification(bool is_local,
                   const base::Time& creation_time,
                   const std::string& guid,
@@ skipping 51 matching lines @@
 };
 
 // A list of AppNotification's.
 typedef std::vector<linked_ptr<AppNotification> > AppNotificationList;
 
 // A way to copy an AppNotificationList, which uses AppNotification::Copy on
 // each element.
 // Caller owns the returned instance.
 AppNotificationList* CopyAppNotificationList(const AppNotificationList& source);
 
+}  // namespace extensions
+
 #endif  // CHROME_BROWSER_EXTENSIONS_APP_NOTIFICATION_H_