Add VectorIconButton functionality to ImageButton.

ash/common/wm/overview/window_selector_item.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/wm/overview/window_selector_item.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/common/material_design/material_design_controller.h"
@@ skipping 129 matching lines @@
   // views::View:
   const char* GetClassName() const override { return "ShieldButton"; }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ShieldButton);
 };
 
 }  // namespace
 
 WindowSelectorItem::OverviewCloseButton::OverviewCloseButton(
-    views::ButtonListener* listener)
-    : views::ImageButton(listener) {
+    views::ImageButtonDelegate* delegate)
+    : views::ImageButton(delegate) {
   SetImage(views::CustomButton::STATE_NORMAL,
            gfx::CreateVectorIcon(kWindowControlCloseIcon, kCloseButtonColor));
   SetImageAlignment(views::ImageButton::ALIGN_CENTER,
                     views::ImageButton::ALIGN_MIDDLE);
   SetMinimumImageSize(gfx::Size(kHeaderHeight, kHeaderHeight));
 }
 
 WindowSelectorItem::OverviewCloseButton::~OverviewCloseButton() {}
 
 // A View having rounded top corners and a specified background color which is
@@ skipping 593 matching lines @@
 
 gfx::SlideAnimation* WindowSelectorItem::GetBackgroundViewAnimation() {
   return background_view_ ? background_view_->animation() : nullptr;
 }
 
 WmWindow* WindowSelectorItem::GetOverviewWindowForMinimizedStateForTest() {
   return transform_window_.GetOverviewWindowForMinimizedState();
 }
 
 }  // namespace ash