Add VectorIconButton functionality to ImageButton.

chrome/browser/ui/views/extensions/extension_install_dialog_view.h

Index: chrome/browser/ui/views/extensions/extension_install_dialog_view.h
diff --git a/chrome/browser/ui/views/extensions/extension_install_dialog_view.h b/chrome/browser/ui/views/extensions/extension_install_dialog_view.h
index fafb61249989c8a65d6fce04bc219cac229b0a8e..ae79adfb00fa6d7d15365da6b2e9a3cef2fa7ed7 100644
--- a/chrome/browser/ui/views/extensions/extension_install_dialog_view.h
+++ b/chrome/browser/ui/views/extensions/extension_install_dialog_view.h
@@ -9,7 +9,7 @@
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "ui/gfx/animation/animation_delegate.h"
 #include "ui/gfx/animation/slide_animation.h"
-#include "ui/views/controls/button/button.h"
+#include "ui/views/controls/button/image_button.h"
 #include "ui/views/controls/link_listener.h"
 #include "ui/views/view.h"
 #include "ui/views/window/dialog_delegate.h"
@@ -31,7 +31,6 @@ class ResourceBundle;
 
 namespace views {
 class GridLayout;
-class ImageButton;
 class Link;
 }
 
@@ -126,7 +125,7 @@ class BulletedView : public views::View {
 
 // A view to display text with an expandable details section.
 class ExpandableContainerView : public views::View,
-                                public views::ButtonListener,
+                                public views::ImageButtonDelegate,
                                 public views::LinkListener,
                                 public gfx::AnimationDelegate {
  public:
@@ -138,7 +137,7 @@ class ExpandableContainerView : public views::View,
   // views::View:
   void ChildPreferredSizeChanged(views::View* child) override;
 
-  // views::ButtonListener:
+  // views::ImageButtonDelegate:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   // views::LinkListener: