Add VectorIconButton functionality to ImageButton.

chrome/browser/ui/views/frame/opaque_browser_frame_view.h

Index: chrome/browser/ui/views/frame/opaque_browser_frame_view.h
diff --git a/chrome/browser/ui/views/frame/opaque_browser_frame_view.h b/chrome/browser/ui/views/frame/opaque_browser_frame_view.h
index ad7b1c9a661c9698626f3f7cec44f8dd52a5c375..485df468fb2ca3e48cc68be2c8a185ac694750f8 100644
--- a/chrome/browser/ui/views/frame/opaque_browser_frame_view.h
+++ b/chrome/browser/ui/views/frame/opaque_browser_frame_view.h
@@ -14,7 +14,7 @@
 #include "chrome/browser/ui/views/frame/browser_non_client_frame_view.h"
 #include "chrome/browser/ui/views/frame/opaque_browser_frame_view_layout_delegate.h"
 #include "chrome/browser/ui/views/tab_icon_view_model.h"
-#include "ui/views/controls/button/button.h"
+#include "ui/views/controls/button/image_button.h"
 #include "ui/views/controls/button/menu_button_listener.h"
 #include "ui/views/window/non_client_view.h"
 
@@ -24,13 +24,12 @@ class OpaqueBrowserFrameViewPlatformSpecific;
 class TabIconView;
 
 namespace views {
-class ImageButton;
 class FrameBackground;
 class Label;
 }
 
 class OpaqueBrowserFrameView : public BrowserNonClientFrameView,
-                               public views::ButtonListener,
+                               public views::ImageButtonDelegate,
                                public views::MenuButtonListener,
                                public TabIconViewModel,
                                public OpaqueBrowserFrameViewLayoutDelegate {
@@ -61,7 +60,7 @@ class OpaqueBrowserFrameView : public BrowserNonClientFrameView,
   // views::View:
   void GetAccessibleNodeData(ui::AXNodeData* node_data) override;
 
-  // views::ButtonListener:
+  // views::ImageButtonDelegate:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   // views::MenuButtonListener: