Add VectorIconButton functionality to ImageButton.

ui/message_center/views/message_center_button_bar.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 UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_BUTTON_BAR_H_
 #define UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_BUTTON_BAR_H_
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "ui/message_center/message_center_export.h"
-#include "ui/views/controls/button/button.h"
 #include "ui/views/controls/button/image_button.h"
 #include "ui/views/view.h"
 
 namespace views {
 class Label;
 }
 
 namespace message_center {
 
 class MessageCenter;
 class MessageCenterView;
 class NotificationCenterButton;
 class NotifierSettingsProvider;
 
 // MessageCenterButtonBar is the class that shows the content outside the main
 // notification area - the label (or NotifierGroup switcher) and the buttons.
 class MessageCenterButtonBar : public views::View,
-                               public views::ButtonListener {
+                               public views::ImageButtonDelegate {
  public:
   MessageCenterButtonBar(MessageCenterView* message_center_view,
                          MessageCenter* message_center,
                          NotifierSettingsProvider* notifier_settings_provider,
                          bool settings_initially_visible,
                          const base::string16& title);
   ~MessageCenterButtonBar() override;
 
   // Enables or disables all of the buttons in the center.  This is used to
   // prevent user clicks during the close-all animation.
@@ skipping 12 matching lines @@
   // Update the label of the title.
   void SetTitle(const base::string16& title);
 
   void SetButtonsVisible(bool visible);
 
  private:
   // Updates the layout manager which can have differing configuration
   // depending on the visibility of different parts of the button bar.
   void ViewVisibilityChanged();
 
-  // Overridden from views::View:
+  // views::View:
   void ChildVisibilityChanged(views::View* child) override;
 
-  // Overridden from views::ButtonListener:
+  // views::ImageButtonDelegate:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   MessageCenterView* message_center_view() const {
     return message_center_view_;
   }
   MessageCenter* message_center() const { return message_center_; }
 
   MessageCenterView* message_center_view_;  // Weak reference.
   MessageCenter* message_center_;           // Weak reference.
 
@@ skipping 13 matching lines @@
   NotificationCenterButton* close_all_button_;
   NotificationCenterButton* settings_button_;
   NotificationCenterButton* quiet_mode_button_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageCenterButtonBar);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_BUTTON_BAR_H_