Step 2 in porting disk cache to using FilePath.

net/disk_cache/file_posix.cc

 // 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.
 
 #include "net/disk_cache/file.h"
 
 #include <fcntl.h>
 
 #include <set>
 
@@ skipping 227 matching lines @@
 }
 
 }  // namespace
 
 namespace disk_cache {
 
 File::File(base::PlatformFile file)
     : init_(true), mixed_(true), platform_file_(file) {
 }
 
-bool File::Init(const std::wstring& name) {
+bool File::Init(const FilePath& name) {
   if (init_)
     return false;
 
   int flags = base::PLATFORM_FILE_OPEN |
               base::PLATFORM_FILE_READ |
               base::PLATFORM_FILE_WRITE;
   platform_file_ = base::CreatePlatformFile(name, flags, NULL);
   if (platform_file_ < 0) {
     platform_file_ = 0;
     return false;
@@ skipping 103 matching lines @@
   return ret;
 }
 
 // Static.
 void File::WaitForPendingIO(int* num_pending_io) {
   if (*num_pending_io)
     Singleton<InFlightIO>::get()->WaitForPendingIO();
 }
 
 }  // namespace disk_cache