Moved ButtonInkDropDelegate logic into InkDropHostView and deleted InkDropDelegates.

ui/views/animation/ink_drop_impl.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_ANIMATION_INK_DROP_IMPL_H_
 #define UI_VIEWS_ANIMATION_INK_DROP_IMPL_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 23 matching lines @@
                                  public InkDropRippleObserver,
                                  public InkDropHighlightObserver {
  public:
   // Constructs an ink drop that will attach the ink drop to the given
   // |ink_drop_host|.
   explicit InkDropImpl(InkDropHost* ink_drop_host);
   ~InkDropImpl() override;
 
   // InkDrop:
   InkDropState GetTargetInkDropState() const override;
-  bool IsVisible() const override;
   void AnimateToState(InkDropState ink_drop_state) override;
   void SnapToActivated() override;
   void SetHovered(bool is_hovered) override;
   void SetFocused(bool is_focused) override;
 
  private:
   friend class test::InkDropImplTestApi;
 
   // Destroys |ink_drop_ripple_| if it's targeted to the HIDDEN state.
   void DestroyHiddenTargetedAnimations();
@@ skipping 89 matching lines @@
   // The timer used to delay the highlight fade in after an ink drop ripple
   // animation.
   std::unique_ptr<base::Timer> highlight_after_ripple_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(InkDropImpl);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_ANIMATION_INK_DROP_IMPL_H_