Fix the settings button and UMA metrics for the message center

ui/message_center/notification_delegate.cc

Index: ui/message_center/notification_delegate.cc
diff --git a/ui/message_center/notification_delegate.cc b/ui/message_center/notification_delegate.cc
index 70675233293179c66f636f56be93e89e35492d9e..de8b60de442b84e1e302ffc256cdb57c61876b4b 100644
--- a/ui/message_center/notification_delegate.cc
+++ b/ui/message_center/notification_delegate.cc
@@ -25,7 +25,9 @@ void NotificationDelegate::ButtonClickWithReply(int button_index,
   NOTIMPLEMENTED();
 }
 
-void NotificationDelegate::SettingsClick() {}
+bool NotificationDelegate::SettingsClick() {
+  return false;
+}
 
 bool NotificationDelegate::ShouldDisplaySettingsButton() {
   return false;