Add VectorIconButton functionality to ImageButton.

chrome/browser/ui/views/tabs/tab.h

Index: chrome/browser/ui/views/tabs/tab.h
diff --git a/chrome/browser/ui/views/tabs/tab.h b/chrome/browser/ui/views/tabs/tab.h
index 7b7bc644e81e50785ca15f69330a514f3126bb59..a14b226df8d3533cf7e83967a7e34edc3214a541 100644
--- a/chrome/browser/ui/views/tabs/tab.h
+++ b/chrome/browser/ui/views/tabs/tab.h
@@ -19,7 +19,7 @@
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/paint_throbber.h"
 #include "ui/views/context_menu_controller.h"
-#include "ui/views/controls/button/button.h"
+#include "ui/views/controls/button/image_button.h"
 #include "ui/views/controls/glow_hover_controller.h"
 #include "ui/views/masked_targeter_delegate.h"
 #include "ui/views/view.h"
@@ -34,7 +34,6 @@ class LinearAnimation;
 class ThrobAnimation;
 }
 namespace views {
-class ImageButton;
 class Label;
 }
 
@@ -44,7 +43,7 @@ class Label;
 //
 ///////////////////////////////////////////////////////////////////////////////
 class Tab : public gfx::AnimationDelegate,
-            public views::ButtonListener,
+            public views::ImageButtonDelegate,
             public views::ContextMenuController,
             public views::MaskedTargeterDelegate,
             public views::View {
@@ -184,7 +183,7 @@ class Tab : public gfx::AnimationDelegate,
   void AnimationCanceled(const gfx::Animation* animation) override;
   void AnimationEnded(const gfx::Animation* animation) override;
 
-  // views::ButtonListener:
+  // views::ImageButtonDelegate:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   // views::ContextMenuController: