Change FileStream to use FilePath instead of wstring.

net/base/file_stream_posix.cc

 // Copyright (c) 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.
 
 // For 64-bit file access (off_t = off64_t, lseek64, etc).
 #define _FILE_OFFSET_BITS 64
 
 #include "net/base/file_stream.h"
 
 #include <sys/types.h>
@@ skipping 56 matching lines @@
     case ENOENT:
       return ERR_FILE_NOT_FOUND;
     case EACCES:
       return ERR_ACCESS_DENIED;
     default:
       LOG(WARNING) << "Unknown error " << err << " mapped to net::ERR_FAILED";
       return ERR_FAILED;
   }
 }
 
-int FileStream::Open(const std::wstring& path, int open_flags) {
+int FileStream::Open(const FilePath& path, int open_flags) {
   if (IsOpen()) {
     DLOG(FATAL) << "File is already open!";
     return ERR_UNEXPECTED;
   }
 
   open_flags_ = open_flags;
-  file_ = base::CreatePlatformFile(path, open_flags_, NULL);
+  file_ = base::CreatePlatformFile(path.ToWStringHack(), open_flags_, NULL);
   if (file_ == base::kInvalidPlatformFileValue) {
     LOG(WARNING) << "Failed to open file: " << errno;
     return MapErrorCode(errno);
   }
 
   return OK;
 }
 
 bool FileStream::IsOpen() const {
   return file_ != base::kInvalidPlatformFileValue;
@@ skipping 73 matching lines @@
       return MapErrorCode(errno);
     }
     total_bytes_written += res;
     buf += res;
     len -= res;
   }
   return total_bytes_written;
 }
 
 }  // namespace net