storage: Cleanup class/struct forward declarations

content/public/test/async_file_test_helper.h

 // Copyright 2014 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 CONTENT_PUBLIC_TEST_ASYNC_FILE_TEST_HELPER_H_
 #define CONTENT_PUBLIC_TEST_ASYNC_FILE_TEST_HELPER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "storage/browser/fileapi/file_system_operation.h"
 #include "storage/common/fileapi/file_system_types.h"
 #include "storage/common/quota/quota_status_code.h"
 
-namespace storage {
-class QuotaManager;
-}
+class GURL;
 
 namespace storage {
 class FileSystemContext;
 class FileSystemURL;
+class QuotaManager;
 }
 
 namespace content {
 
 // A helper class to perform async file operations in a synchronous way.
 class AsyncFileTestHelper {
  public:
   typedef storage::FileSystemOperation::FileEntryList FileEntryList;
   typedef storage::FileSystemOperation::CopyProgressCallback
       CopyProgressCallback;
@@ skipping 73 matching lines @@
       storage::QuotaManager* quota_manager,
       const GURL& origin,
       storage::FileSystemType type,
       int64_t* usage,
       int64_t* quota);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_ASYNC_FILE_TEST_HELPER_H_