[MD] Use same focus ring on BarControlButton as MdTextButton.

ui/views/controls/button/image_button.cc

Index: ui/views/controls/button/image_button.cc
diff --git a/ui/views/controls/button/image_button.cc b/ui/views/controls/button/image_button.cc
index fdaa27530d547647f5e46810d45a55aaa70ea86b..a79341914dec715e6c0ce61f900a39cfc7cdb6df 100644
--- a/ui/views/controls/button/image_button.cc
+++ b/ui/views/controls/button/image_button.cc
@@ -136,13 +136,13 @@ void ImageButton::OnPaint(gfx::Canvas* canvas) {
 // ImageButton, protected:
 
 void ImageButton::OnFocus() {
-  View::OnFocus();
+  CustomButton::OnFocus();
   if (focus_painter_.get())
     SchedulePaint();
 }
 
 void ImageButton::OnBlur() {
-  View::OnBlur();
+  CustomButton::OnBlur();
   if (focus_painter_.get())
     SchedulePaint();
 }