Add VectorIconButton functionality to ImageButton.

ui/message_center/views/message_center_button_bar.cc

Index: ui/message_center/views/message_center_button_bar.cc
diff --git a/ui/message_center/views/message_center_button_bar.cc b/ui/message_center/views/message_center_button_bar.cc
index 14f2283a0ba446d7d9f80a354903d614bd52d0d5..ae7a8d281ec9df55cb1eb7dec6699137c582a5e8 100644
--- a/ui/message_center/views/message_center_button_bar.cc
+++ b/ui/message_center/views/message_center_button_bar.cc
@@ -17,7 +17,6 @@
 #include "ui/message_center/views/message_center_view.h"
 #include "ui/resources/grit/ui_resources.h"
 #include "ui/strings/grit/ui_strings.h"
-#include "ui/views/controls/button/button.h"
 #include "ui/views/controls/button/image_button.h"
 #include "ui/views/controls/button/label_button.h"
 #include "ui/views/controls/button/menu_button.h"
@@ -43,7 +42,7 @@ const int kFooterRightMargin = 14;
 ////////////////////////////////////////////////////////////////////////////////
 class NotificationCenterButton : public views::ToggleImageButton {
  public:
-  NotificationCenterButton(views::ButtonListener* listener,
+  NotificationCenterButton(views::ImageButtonDelegate* listener,
                            int normal_id,
                            int hover_id,
                            int pressed_id,
@@ -61,7 +60,7 @@ class NotificationCenterButton : public views::ToggleImageButton {
 };
 
 NotificationCenterButton::NotificationCenterButton(
-    views::ButtonListener* listener,
+    views::ImageButtonDelegate* listener,
     int normal_id,
     int hover_id,
     int pressed_id,