Correctly remove file browser notifications from Ash notification tray.

chrome/browser/chromeos/extensions/file_browser_notifications.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_CHROMEOS_EXTENSIONS_FILE_BROWSER_NOTIFICATIONS_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_BROWSER_NOTIFICATIONS_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 66 matching lines @@
   typedef std::map<std::string, NotificationMessage*> NotificationMap;
 
   std::string CreateNotificationId(NotificationType type,
                                    const std::string& path);
   NotificationMessage* GetNotification(NotificationType type,
                                        const std::string& path,
                                        const string16& message);
   void ShowNotificationById(NotificationType type,
                             const std::string& notification_id,
                             const string16& message);
-  void HideNotificationById(const std::string& id);
+  void HideNotificationById(const std::string& notification_id);
+  void RemoveNotificationById(const std::string& notification_id);
 
   NotificationMap notification_map_;
   std::set<std::string> hidden_notifications_;
   MountRequestsMap mount_requests_;
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(FileBrowserNotifications);
 };
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_BROWSER_NOTIFICATIONS_H_