Convert BlockFiles to use FilePath instead of wstring.

net/disk_cache/cache_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 NET_DISK_CACHE_CACHE_UTIL_H_
 #define NET_DISK_CACHE_CACHE_UTIL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 
 class FilePath;
 
 namespace disk_cache {
 
 // Moves the cache files from the given path to another location.
 // Returns true if successful, false otherwise.
 bool MoveCache(const FilePath& from_path, const FilePath& to_path);
 
 // Deletes the cache files stored on |path|, and optionally also attempts to
 // delete the folder itself.
 void DeleteCache(const FilePath& path, bool remove_folder);
 // Deprecated.
 void DeleteCache(const std::wstring& path, bool remove_folder);
 
 // Deletes a cache file.
 bool DeleteCacheFile(const FilePath& name);
-// Deprecated.
-bool DeleteCacheFile(const std::wstring& name);
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_CACHE_UTIL_H_