Implement some missing file util functions.

base/file_util_linux.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 "base/file_util.h"
 
 #include <fcntl.h>
 
 #include <string>
 #include <vector>
 
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 
 namespace file_util {
 
 const wchar_t kPathSeparator = L'/';
 
 bool GetTempDir(FilePath* path) {
   const char* tmp = getenv("TMPDIR");
   if (tmp)
     *path = FilePath(tmp);
   else
     *path = FilePath("/tmp");
   return true;
 }
 
-FILE* OpenFile(const FilePath& filename, const char* mode) {
-  return fopen(filename.value().c_str(), mode);
-}
-
 bool CopyFile(const FilePath& from_path, const FilePath& to_path) {
   int infile = open(from_path.value().c_str(), O_RDONLY);
   if (infile < 0)
     return false;
   
   int outfile = creat(to_path.value().c_str(), 0666);
   if (outfile < 0) {
     close(infile);
     return false;
   }
@@ skipping 27 matching lines @@
 
   if (close(infile) < 0)
     result = false;
   if (close(outfile) < 0)
     result = false;
 
   return result;
 }
 
 }  // namespace file_util