Remove unused TableViewRowBackgroundPainter class.

ui/views/controls/table/table_view_row_background_painter.h

-// Copyright (c) 2012 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_TABLE_TABLE_VIEW_ROW_BACKGROUND_PAINTER_H_
-#define UI_VIEWS_CONTROLS_TABLE_TABLE_VIEW_ROW_BACKGROUND_PAINTER_H_
-
-#include "ui/views/views_export.h"
-
-namespace gfx {
-class Canvas;
-class Rect;
-}
-
-namespace views {
-
-// TableViewRowBackgroundPainter is used to paint the background of a row in the
-// table.
-class VIEWS_EXPORT TableViewRowBackgroundPainter {
- public:
-  virtual ~TableViewRowBackgroundPainter() {}
-  virtual void PaintRowBackground(int model_index,
-                                  const gfx::Rect& row_bounds,
-                                  gfx::Canvas* canvas) = 0;
-};
-
-}
-
-#endif  // UI_VIEWS_CONTROLS_TABLE_TABLE_VIEW_ROW_BACKGROUND_PAINTER_H_