Add VectorIconButton functionality to ImageButton.

chrome/browser/ui/views/location_bar/zoom_bubble_view.h

Index: chrome/browser/ui/views/location_bar/zoom_bubble_view.h
diff --git a/chrome/browser/ui/views/location_bar/zoom_bubble_view.h b/chrome/browser/ui/views/location_bar/zoom_bubble_view.h
index 81db642872cf45c8f91ea5d44fa3edec6d52a2d3..4373534aef5ad69a4d7a73e2a6e560cb46998067 100644
--- a/chrome/browser/ui/views/location_bar/zoom_bubble_view.h
+++ b/chrome/browser/ui/views/location_bar/zoom_bubble_view.h
@@ -13,20 +13,16 @@
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "extensions/browser/extension_icon_image.h"
-#include "ui/views/controls/button/button.h"
+#include "ui/views/controls/button/image_button.h"
 #include "ui/views/controls/label.h"
 
 namespace content {
 class WebContents;
 }
 
-namespace views {
-class ImageButton;
-}  // namespace views
-
 // View used to display the zoom percentage when it has changed.
 class ZoomBubbleView : public LocationBarBubbleDelegateView,
-                       public views::ButtonListener,
+                       public views::ImageButtonDelegate,
                        public ImmersiveModeController::Observer,
                        public extensions::IconImage::Observer {
  public:
@@ -78,7 +74,7 @@ class ZoomBubbleView : public LocationBarBubbleDelegateView,
   void WindowClosing() override;
   void CloseBubble() override;
 
-  // views::ButtonListener:
+  // views::ImageButtonDelegate:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   // ImmersiveModeController::Observer: