Moved ButtonInkDropDelegate logic into InkDropHostView and deleted InkDropDelegates.

ui/views/animation/ink_drop.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_H_
 #define UI_VIEWS_ANIMATION_INK_DROP_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 13 matching lines @@
 
 // Pure virtual base class that manages the lifetime and state of an ink drop
 // ripple as well as visual hover state feedback.
 class VIEWS_EXPORT InkDrop {
  public:
   virtual ~InkDrop() {}
 
   // Gets the target state of the ink drop.
   virtual InkDropState GetTargetInkDropState() const = 0;
 
-  // Returns true when the ripple is visible, including when animating to
-  // HIDDEN.
-  virtual bool IsVisible() const = 0;
-
   // Animates from the current InkDropState to |ink_drop_state|.
   virtual void AnimateToState(InkDropState ink_drop_state) = 0;
 
   // Immediately snaps the InkDropState to ACTIVATED. This more specific
   // implementation of the non-existent SnapToState(InkDropState) function is
   // the only one available because it was the only InkDropState that clients
   // needed to skip animations for.
   virtual void SnapToActivated() = 0;
 
   // Enables or disables the hover state.
   virtual void SetHovered(bool is_hovered) = 0;
 
   // Enables or disables the focus state.
   virtual void SetFocused(bool is_focused) = 0;
 
  protected:
   InkDrop() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InkDrop);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_ANIMATION_INK_DROP_H_