Add VectorIconButton functionality to ImageButton.

ui/app_list/views/search_box_view.cc

Index: ui/app_list/views/search_box_view.cc
diff --git a/ui/app_list/views/search_box_view.cc b/ui/app_list/views/search_box_view.cc
index 2d70b80eca8c6e74651189199f843f1795272b50..4cc59b98189abe858d811701add7fb9a277e9d3c 100644
--- a/ui/app_list/views/search_box_view.cc
+++ b/ui/app_list/views/search_box_view.cc
@@ -27,7 +27,6 @@
 #include "ui/strings/grit/ui_strings.h"
 #include "ui/views/background.h"
 #include "ui/views/border.h"
-#include "ui/views/controls/button/image_button.h"
 #include "ui/views/controls/image_view.h"
 #include "ui/views/controls/textfield/textfield.h"
 #include "ui/views/layout/box_layout.h"
@@ -72,7 +71,7 @@ class SearchBoxBackground : public views::Background {
 // To paint grey background on mic and back buttons
 class SearchBoxImageButton : public views::ImageButton {
  public:
-  explicit SearchBoxImageButton(views::ButtonListener* listener)
+  explicit SearchBoxImageButton(views::ImageButtonDelegate* listener)
       : ImageButton(listener), selected_(false) {}
   ~SearchBoxImageButton() override {}