Cleanup: Remove unused ntp_background_util.* component.

chrome/browser/ui/ntp_background_util.h

-// Copyright (c) 2009 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_UI_NTP_BACKGROUND_UTIL_H_
-#define CHROME_BROWSER_UI_NTP_BACKGROUND_UTIL_H_
-
-namespace gfx {
-class Canvas;
-class Rect;
-}
-
-namespace ui {
-class ThemeProvider;
-}
-
-class NtpBackgroundUtil {
- public:
-  // Paints the NTP background on |canvas|. |area| is the area of the canvas
-  // that gets painted and also serves as the origin of the image (for top-
-  // aligned images). |tab_contents_height| is necessary for correctly painting
-  // bottom-aligned images since then the origin is the bottom of the web page.
-  static void PaintBackgroundDetachedMode(
-      ui::ThemeProvider* tp, gfx::Canvas* canvas,
-      const gfx::Rect& area, int tab_contents_height);
-
- private:
-  NtpBackgroundUtil() {}
-};
-
-#endif  // CHROME_BROWSER_UI_NTP_BACKGROUND_UTIL_H_