Removing some now-unused headers.

chrome/browser/chromeos/login/image_background.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_CHROMEOS_LOGIN_IMAGE_BACKGROUND_H_
-#define CHROME_BROWSER_CHROMEOS_LOGIN_IMAGE_BACKGROUND_H_
-
-#include "base/basictypes.h"
-#include "views/background.h"
-#include "app/gfx/canvas.h"
-
-namespace gfx {
-class Canvas;
-}
-
-namespace views {
-
-class ImageBackground : public Background {
-  public:
-    explicit ImageBackground(GdkPixbuf* background_image)
-      : background_image_(background_image) {
-    }
-
-    virtual ~ImageBackground() {}
-
-    void Paint(gfx::Canvas* canvas, View* view) const {
-      canvas->DrawGdkPixbuf(background_image_, 0, 0);
-    }
-  private:
-    // Background image that is drawn by this background.
-    // This class does _not_ take ownership of the image.
-    GdkPixbuf* background_image_;
-    DISALLOW_COPY_AND_ASSIGN(ImageBackground);
-};
-
-}  // namespace views
-
-#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_IMAGE_BACKGROUND_H_
-