Fix appearance of disabled VectorIconButtons.

ui/views/controls/button/vector_icon_button.h

 // Copyright 2015 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.
 
 #ifndef UI_VIEWS_CONTROLS_BUTTON_VECTOR_ICON_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_VECTOR_ICON_BUTTON_H_
 
 #include "base/macros.h"
 #include "ui/views/controls/button/image_button.h"
 
@@ skipping 10 matching lines @@
 class VIEWS_EXPORT VectorIconButton : public views::ImageButton {
  public:
   explicit VectorIconButton(VectorIconButtonDelegate* delegate);
   ~VectorIconButton() override;
 
   // Sets the icon to display and provides a callback which should return the
   // text color from which to derive this icon's color.
   void SetIcon(gfx::VectorIconId id);
 
   // views::ImageButton:
-  void OnEnabledChanged() override;
   void OnThemeChanged() override;
   void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
 
  private:
   VectorIconButtonDelegate* delegate_;
   gfx::VectorIconId id_;
 
   DISALLOW_COPY_AND_ASSIGN(VectorIconButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_VECTOR_ICON_BUTTON_H_