Remove fileapi::FileSystemFileUtil dependency in media gallery code

chrome/browser/media_galleries/fileapi/itunes_file_util_unittest.cc

 // Copyright 2013 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 <set>
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 10 matching lines @@
 #include "content/public/test/test_browser_thread.h"
 #include "content/public/test/test_file_system_options.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webkit/browser/fileapi/async_file_util.h"
 #include "webkit/browser/fileapi/external_mount_points.h"
 #include "webkit/browser/fileapi/file_system_context.h"
 #include "webkit/browser/fileapi/file_system_operation_context.h"
 #include "webkit/browser/fileapi/file_system_operation_runner.h"
 #include "webkit/browser/quota/mock_special_storage_policy.h"
 
-using fileapi::FileSystemFileUtil;
 using fileapi::FileSystemOperationContext;
 using fileapi::FileSystemOperation;
 using fileapi::FileSystemURL;
 
 namespace itunes {
 
 namespace {
 
 void ReadDirectoryTestHelperCallback(
     base::RunLoop* run_loop,
@@ skipping 294 matching lines @@
   completed = false;
   ReadDirectoryTestHelper(operation_runner(), url, &contents, &completed);
   ASSERT_TRUE(completed);
   ASSERT_EQ(1u, contents.size());
   EXPECT_FALSE(contents.front().is_directory);
   EXPECT_EQ(base::FilePath().AppendASCII("baz.ogg").value(),
             contents.front().name);
 }
 
 }  // namespace itunes