* Revert "Por rt flush_cache tool."

chrome/test/test_file_util.h

 // Copyright (c) 2006-2008 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 CHROME_TEST_TEST_FILE_UTIL_H_
-#define CHROME_TEST_TEST_FILE_UTIL_H_
+#ifndef CHROME_TEST_TEST_FILE_UTIL_H__
+#define CHROME_TEST_TEST_FILE_UTIL_H__
 
 // File utility functions used only by tests.
 
 #include <string>
 
 namespace file_util {
 
+// Clear a specific file from the system cache using a neat trick. After this
+// call, trying to access this file will result in a cold load from the hard
+// drive.
+bool EvictFileFromSystemCache(const wchar_t* file);
+
 // Like CopyFileNoCache but recursively copies all files and subdirectories
 // in the given input directory to the output directory. Any files in the
 // destination that already exist will be overwritten.
 //
 // Returns true on success. False means there was some error copying, so the
 // state of the destination is unknown.
 bool CopyRecursiveDirNoCache(const std::wstring& source_dir,
                              const std::wstring& dest_dir);
 
 }  // namespace file_util
 
-#endif  // CHROME_TEST_TEST_FILE_UTIL_H_
+#endif  // CHROME_TEST_TEST_FILE_UTIL_H__