Remove last MD reference from TrayPopupUtils.

ui/views/controls/md_slider.h

-// Copyright 2016 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_MD_SLIDER_H_
-#define UI_VIEWS_CONTROLS_MD_SLIDER_H_
-
-#include "base/macros.h"
-#include "ui/views/controls/slider.h"
-#include "ui/views/view.h"
-#include "ui/views/views_export.h"
-
-namespace gfx {
-class SlideAnimation;
-}
-
-namespace views {
-
-// TODO(yiyix): When material design is enabled by default, use
-// MdSlider as the default slider implementation. (crbug.com/614453)
-class VIEWS_EXPORT MdSlider : public Slider {
- public:
-  explicit MdSlider(SliderListener* listener);
-  ~MdSlider() override;
-
-  // ui::Slider:
-  void UpdateState(bool control_on) override;
-
-  // views::View:
-  void OnPaint(gfx::Canvas* canvas) override;
-  const char* GetClassName() const override;
-
- protected:
-  // ui::Slider:
-  int GetThumbWidth() override;
-  void SetHighlighted(bool is_highlighted) override;
-
- private:
-  // gfx::AnimationDelegate:
-  void AnimationProgressed(const gfx::Animation* animation) override;
-  void AnimationEnded(const gfx::Animation* animation) override;
-
-  // Record whether the slider is in the active state or the disabled state.
-  bool is_active_;
-
-  // Animating value of the current radius of the thumb's highlight.
-  float thumb_highlight_radius_;
-
-  std::unique_ptr<gfx::SlideAnimation> highlight_animation_;
-
-  DISALLOW_COPY_AND_ASSIGN(MdSlider);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_CONTROLS_MD_SLIDER_H_