Extract the view of control buttons on notification into a separated class

ui/message_center/views/notification_view.cc

 // 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.
 
 #include "ui/message_center/views/notification_view.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/macros.h"
@@ skipping 370 matching lines @@
   std::string id(notification_id());
 
   if (close_button_ && sender == close_button_.get()) {
     // Warning: This causes the NotificationView itself to be deleted, so don't
     // do anything afterwards.
     OnCloseButtonPressed();
     return;
   }
 
   if (sender == settings_button_view_) {
-    controller()->ClickOnSettingsButton(id);
+    OnSettingsButtonPressed();
     return;
   }
 
   // See if the button pressed was an action button.
   for (size_t i = 0; i < action_buttons_.size(); ++i) {
     if (sender == action_buttons_[i]) {
       controller()->ClickOnNotificationButton(id, i);
       return;
     }
   }
@@ skipping 370 matching lines @@
 
   return message_line_limit;
 }
 
 int NotificationView::GetMessageHeight(int width, int limit) const {
   return message_view_ ?
          message_view_->GetSizeForWidthAndLines(width, limit).height() : 0;
 }
 
 }  // namespace message_center