More old files deletion.

ui/gfx/image/image_unittest_util_mac.mm

-// 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.
-
-#import <AppKit/AppKit.h>
-
-#include "skia/ext/skia_utils_mac.h"
-#include "ui/gfx/image/image_unittest_util.h"
-
-namespace gfx {
-namespace test {
-
-SkColor GetPlatformImageColor(PlatformImage image, int x, int y) {
-  // AppKit's coordinate system is flipped.
-  y = [image size].height - y;
-
-  [image lockFocus];
-  NSColor* color = NSReadPixel(NSMakePoint(x, y));
-  [image unlockFocus];
-  return NSDeviceColorToSkColor(color);
-}
-
-}  // namespace test
-}  // namespace gfx