Add VectorIconButton functionality to ImageButton.

ui/views/controls/button/vector_icon_button_delegate.cc

Index: ui/views/controls/button/vector_icon_button_delegate.cc
diff --git a/ui/views/controls/button/vector_icon_button_delegate.cc b/ui/views/controls/button/vector_icon_button_delegate.cc
deleted file mode 100644
index f2240cc4cd704ab836f2865c265da3fd095cb253..0000000000000000000000000000000000000000
--- a/ui/views/controls/button/vector_icon_button_delegate.cc
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright 2016 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 "ui/views/controls/button/vector_icon_button_delegate.h"
-
-namespace views {
-
-SkColor VectorIconButtonDelegate::GetVectorIconBaseColor() const {
-  return SK_ColorBLACK;
-}
-
-}  // namespace views