Moved ButtonInkDropDelegate logic into InkDropHostView and deleted InkDropDelegates.

ui/views/controls/button/md_text_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_MD_TEXT_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_MD_TEXT_BUTTON_H_
 
 #include <memory>
 
-#include "ui/views/animation/button_ink_drop_delegate.h"
 #include "ui/views/controls/button/label_button.h"
 
 namespace views {
 
 // A button class that implements the Material Design text button spec.
 class VIEWS_EXPORT MdTextButton : public LabelButton {
  public:
   // Describes the presentation of a button. A stronger call to action draws
   // more attention.
   enum CallToAction {
@@ skipping 43 matching lines @@
 
   // The call to action style for this button.
   CallToAction cta_;
 
   DISALLOW_COPY_AND_ASSIGN(MdTextButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_MD_TEXT_BUTTON_H_