Remove references to non-Aura Win WebThemeEngine implementation.

content/child/webthemeengine_impl_win.h

-// Copyright 2014 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 CONTENT_CHILD_WEBTHEMEENGINE_IMPL_WIN_H_
-#define CONTENT_CHILD_WEBTHEMEENGINE_IMPL_WIN_H_
-
-#include "third_party/WebKit/public/platform/win/WebThemeEngine.h"
-
-namespace content {
-
-class WebThemeEngineImpl : public blink::WebThemeEngine {
- public:
-  // WebThemeEngine methods:
-  virtual void paintButton(
-      blink::WebCanvas* canvas, int part, int state, int classic_state,
-      const blink::WebRect& rect);
-  virtual void paintMenuList(
-      blink::WebCanvas* canvas, int part, int state, int classic_state,
-      const blink::WebRect& rect);
-  virtual void paintScrollbarArrow(
-      blink::WebCanvas* canvas, int state, int classic_state,
-      const blink::WebRect& rect);
-  virtual void paintScrollbarThumb(
-      blink::WebCanvas* canvas, int part, int state, int classic_state,
-      const blink::WebRect& rect);
-  virtual void paintScrollbarTrack(
-      blink::WebCanvas* canvas, int part, int state, int classic_state,
-      const blink::WebRect& rect, const blink::WebRect& align_rect);
-  virtual void paintSpinButton(
-      blink::WebCanvas* canvas, int part, int state, int classic_state,
-      const blink::WebRect& rect);
-  virtual void paintTextField(
-      blink::WebCanvas* canvas, int part, int state, int classic_state,
-      const blink::WebRect& rect, blink::WebColor color,
-      bool fill_content_area, bool draw_edges);
-  virtual void paintTrackbar(
-      blink::WebCanvas* canvas, int part, int state, int classic_state,
-      const blink::WebRect& rect);
-  virtual void paintProgressBar(
-      blink::WebCanvas* canvas, const blink::WebRect& barRect,
-      const blink::WebRect& valueRect, bool determinate,
-      double animatedSeconds);
-  virtual blink::WebSize getSize(int part);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_WEBTHEMEENGINE_IMPL_WIN_H_