Make MediaFileUtil run on thread pool.

webkit/fileapi/file_system_dir_url_request_job_unittest.cc

 // 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 "webkit/fileapi/file_system_dir_url_request_job.h"
 
 #include <string>
 
 #include "base/file_path.h"
 #include "base/format_macros.h"
@@ skipping 36 matching lines @@
 
   virtual void SetUp() OVERRIDE {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
 
     file_thread_proxy_ = base::MessageLoopProxy::current();
 
     special_storage_policy_ = new quota::MockSpecialStoragePolicy;
     file_system_context_ =
         new FileSystemContext(
             file_thread_proxy_,
+            file_thread_proxy_,
             base::MessageLoopProxy::current(),
             special_storage_policy_, NULL,
             temp_dir_.path(),
             CreateAllowFileAccessOptions());
 
     file_system_context_->sandbox_provider()->ValidateFileSystemRoot(
         GURL("http://remote/"), kFileSystemTypeTemporary, true,  // create
         base::Bind(&FileSystemDirURLRequestJobTest::OnValidateFileSystem,
                    weak_factory_.GetWeakPtr()));
     MessageLoop::current()->RunAllPending();
@@ skipping 220 matching lines @@
   CreateDirectory("foo");
   TestRequestNoRun(CreateFileSystemURL("foo/"));
   // Run StartAsync() and only StartAsync().
   MessageLoop::current()->DeleteSoon(FROM_HERE, request_.release());
   MessageLoop::current()->RunAllPending();
   // If we get here, success! we didn't crash!
 }
 
 }  // namespace (anonymous)
 }  // namespace fileapi