Moved ButtonInkDropDelegate logic into InkDropHostView and deleted InkDropDelegates.

ui/views/controls/button/md_text_button.cc

 // 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.
 
 #include "ui/views/controls/button/md_text_button.h"
 
 #include "base/i18n/case_conversion.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/color_utils.h"
@@ skipping 155 matching lines @@
   if (!is_default())
     SetCallToAction(NO_CALL_TO_ACTION);
   else if (cta_ == NO_CALL_TO_ACTION)
     SetCallToAction(WEAK_CALL_TO_ACTION);
 }
 
 MdTextButton::MdTextButton(ButtonListener* listener)
     : LabelButton(listener, base::string16()),
       focus_ring_(new MdFocusRing()),
       cta_(NO_CALL_TO_ACTION) {
-  set_ink_drop_delegate(
-      base::WrapUnique(new ButtonInkDropDelegate(this, this)));
+  SetHasInkDrop(true);
   set_has_ink_drop_action_on_click(true);
   SetHorizontalAlignment(gfx::ALIGN_CENTER);
   SetFocusForPlatform();
   SetMinSize(gfx::Size(kMinWidth, 0));
   SetFocusPainter(nullptr);
   label()->SetAutoColorReadabilityEnabled(false);
 
   AddChildView(focus_ring_);
   focus_ring_->SetVisible(false);
   set_request_focus_on_press(false);
@@ skipping 26 matching lines @@
       cta_ == STRONG_CALL_TO_ACTION
           ? Background::CreateBackgroundPainter(
                 true, Painter::CreateSolidRoundRectPainter(
                           theme->GetSystemColor(
                               ui::NativeTheme::kColorId_CallToActionColor),
                           kInkDropSmallCornerRadius))
           : nullptr);
 }
 
 }  // namespace views