Deflake Simple Cache backend on Windows.

net/disk_cache/simple/simple_util.h

 // Copyright (c) 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.
 
 #ifndef NET_DISK_CACHE_SIMPLE_SIMPLE_UTIL_H_
 #define NET_DISK_CACHE_SIMPLE_SIMPLE_UTIL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 51 matching lines @@
                                                        int32 data_size);
 
 // Given the stream index, returns the number of the file the stream is stored
 // in.
 NET_EXPORT_PRIVATE int GetFileIndexFromStreamIndex(int stream_index);
 
 // Fills |out_time| with the time the file last modified time. Unlike the
 // functions in file.h, the time resolution is milliseconds.
 NET_EXPORT_PRIVATE bool GetMTime(const base::FilePath& path,
                                  base::Time* out_mtime);
-}  // namespace simple_backend
+
+// Deletes a file, insuring POSIX semantics. Provided that all open handles to
+// this file were opened with File::FLAG_SHARE_DELETE, it is possible to delete

[pasko, 2014/10/29 13:01:01]

I would say "Emulates deleting the file", but I'll leave it for your taste to
choose the name.

+// an open file and continue to use that file. After deleting an open file, it
+// is possible to immediately create a new file with the same name.
+NET_EXPORT_PRIVATE bool SimpleCacheDeleteFile(const base::FilePath& path);
+
+}  // namespace simple_util
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_SIMPLE_SIMPLE_UTIL_H_