Fix broken iOS skia test and make sure it is compiled

skia/ext/skia_utils_ios_unittest.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.
 
 #include "skia/ext/skia_utils_ios.h"
 
 #import <ImageIO/ImageIO.h>
 #import <UIKit/UIKit.h>
 
 #include "base/base64.h"
+#include "base/ios/ios_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 typedef testing::Test SkiaUtilsIosTest;
 
 // This is a base64 encoded version of google.com ico file. generated by
 // curl http://www.google.com/favicon.ico | base64 -b 76
 const char kIcoEncodedData[] =
   "AAABAAIAEBAAAAEAIABoBAAAJgAAACAgAAABACAAqBAAAI4EAAAoAAAAEAAAACAAAAABACAAAAAA"
@@ skipping 129 matching lines @@
 }
 
 TEST_F(SkiaUtilsIosTest, EmptyDataFailure) {
   std::vector<SkBitmap> bitmaps(gfx::ImageDataToSkBitmaps([NSData data]));
 
   EXPECT_EQ(0UL, bitmaps.size());
 }
 
 }  // namespace