Revert of Monitor the system native frame color on Win 10.

chrome/browser/themes/theme_service_win.h

Index: chrome/browser/themes/theme_service_win.h
diff --git a/chrome/browser/themes/theme_service_win.h b/chrome/browser/themes/theme_service_win.h
deleted file mode 100644
index 0f0473df7d8937d65fbabdcaee1bf811282e766a..0000000000000000000000000000000000000000
--- a/chrome/browser/themes/theme_service_win.h
+++ /dev/null
@@ -1,39 +0,0 @@
-// 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 CHROME_BROWSER_THEMES_THEME_SERVICE_WIN_H_
-#define CHROME_BROWSER_THEMES_THEME_SERVICE_WIN_H_
-
-#include "base/win/registry.h"
-#include "chrome/browser/themes/theme_service.h"
-
-class ThemeServiceWin : public ThemeService {
- public:
-  ThemeServiceWin();
-  ~ThemeServiceWin() override;
-
- private:
-  // ThemeService:
-  bool ShouldUseNativeFrame() const override;
-  SkColor GetDefaultColor(int id, bool incognito) const override;
-
-  // Returns true if the window frame color is determined by the DWM, i.e. this
-  // is a native frame on Windows 10.
-  bool ShouldUseDwmFrameColor() const;
-
-  // Callback executed when |dwm_key_| is updated.  This re-reads the active
-  // frame color and updates |dwm_frame_color_|.
-  void OnDwmKeyUpdated();
-
-  // Registry key containing the params that determine the DWM frame color.
-  // This is only initialized on Windows 10.
-  scoped_ptr<base::win::RegKey> dwm_key_;
-
-  // The DWM frame color, if available; white otherwise.
-  SkColor dwm_frame_color_;
-
-  DISALLOW_COPY_AND_ASSIGN(ThemeServiceWin);
-};
-
-#endif  // CHROME_BROWSER_THEMES_THEME_SERVICE_WIN_H_