content: Cleanup class/struct forward declarations

content/test/fileapi_test_file_set.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_TEST_FILEAPI_TEST_FILE_SET_H_
 #define CONTENT_TEST_FILEAPI_TEST_FILE_SET_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
 
 #include "base/files/file_path.h"
 
 // Common test data structures and test cases.
 
-namespace storage {
-class FileSystemFileUtil;
-}
-
 namespace content {
 
 struct FileSystemTestCaseRecord {
   bool is_directory;
   const base::FilePath::CharType path[64];
   int64_t data_file_size;
 };
 
 extern const FileSystemTestCaseRecord kRegularFileSystemTestCases[];
 extern const size_t kRegularFileSystemTestCaseSize;
 
 size_t GetRegularFileSystemTestCaseSize();
 
 // Creates one file or directory specified by |record|.
 void SetUpOneFileSystemTestCase(const base::FilePath& root_path,
                                 const FileSystemTestCaseRecord& record);
 
 // Creates the files and directories specified in kRegularTestCases.
 void SetUpRegularFileSystemTestCases(const base::FilePath& root_path);
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_FILEAPI_TEST_FILE_SET_H_