Convert base::file_util to use File instead of PlatformFile.

net/disk_cache/simple/simple_util.cc

 // 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.
 
 #include "net/disk_cache/simple/simple_util.h"
 
 #include <limits>
 
 #include "base/file_util.h"
 #include "base/format_macros.h"
@@ skipping 107 matching lines @@
     return false;
   time_t sec;
   long nsec;
   if (GetNanoSecsFromStat(file_stat, &sec, &nsec)) {
     int64 usec = (nsec / base::Time::kNanosecondsPerMicrosecond);
     *out_mtime = base::Time::FromTimeT(sec)
         + base::TimeDelta::FromMicroseconds(usec);
     return true;
   }
 #endif
-  base::PlatformFileInfo file_info;
+  base::File::Info file_info;
   if (!base::GetFileInfo(path, &file_info))
     return false;
   *out_mtime = file_info.last_modified;
   return true;
 }
 
 }  // namespace simple_backend
 
 }  // namespace disk_cache