Fix the settings button and UMA metrics for the message center

chrome/browser/notifications/message_center_stats_collector.h

 // Copyright 2013 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_NOTIFICATIONS_MESSAGE_CENTER_STATS_COLLECTOR_H_
 #define CHROME_BROWSER_NOTIFICATIONS_MESSAGE_CENTER_STATS_COLLECTOR_H_
 
 #include <set>
 #include <string>
 
@@ skipping 53 matching lines @@
   };
 
   // MessageCenterObserver
   void OnNotificationAdded(const std::string& notification_id) override;
   void OnNotificationRemoved(const std::string& notification_id,
                              bool by_user) override;
   void OnNotificationUpdated(const std::string& notification_id) override;
   void OnNotificationClicked(const std::string& notification_id) override;
   void OnNotificationButtonClicked(const std::string& notification_id,
                                    int button_index) override;
-  void OnNotificationSettingsClicked() override;
+  void OnNotificationSettingsClicked(bool handled) override;
   void OnNotificationDisplayed(
       const std::string& notification_id,
       const message_center::DisplaySource source) override;
   void OnCenterVisibilityChanged(
       message_center::Visibility visibility) override;
   void OnQuietModeChanged(bool in_quiet_mode) override;
 
   // Weak, global.
   message_center::MessageCenter* message_center_;
 
   typedef std::map<std::string,NotificationStats> StatsCollection;
   StatsCollection stats_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageCenterStatsCollector);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_MESSAGE_CENTER_STATS_COLLECTOR_H_