[ash-md] Added different highlighting modes to the InkDropImpl.

ui/views/controls/button/checkbox.h

Index: ui/views/controls/button/checkbox.h
diff --git a/ui/views/controls/button/checkbox.h b/ui/views/controls/button/checkbox.h
index 2668aade26f700be456d802bf2f52a24d3792b11..d2ca6efe25d6e102c07bb72010588802f0a24c49 100644
--- a/ui/views/controls/button/checkbox.h
+++ b/ui/views/controls/button/checkbox.h
@@ -20,9 +20,6 @@ enum class VectorIconId;
 
 namespace views {
 
-class InkDropHover;
-class InkDropRipple;
-
 // A native themed class representing a checkbox.  This class does not use
 // platform specific objects to replicate the native platforms looks and feel.
 class VIEWS_EXPORT Checkbox : public LabelButton {
@@ -53,7 +50,6 @@ class VIEWS_EXPORT Checkbox : public LabelButton {
   void OnBlur() override;
   void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
   std::unique_ptr<InkDropRipple> CreateInkDropRipple() const override;
-  std::unique_ptr<InkDropHighlight> CreateInkDropHighlight() const override;
   SkColor GetInkDropBaseColor() const override;
   gfx::ImageSkia GetImage(ButtonState for_state) const override;