Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/tools/safe_browsing/sb_sigutil.cc

 // Copyright (c) 2011 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.
 //
 // Simple tool that uses the SignatureUtil class to extract signature
 // information from an executable.  The output is an encoded
 // ClientDownloadRequest_SignatureInfo protocol buffer.
 //
 // Example usage: sb_sigutil --executable=blah.exe --output=siginfo.pb
 
@@ skipping 26 matching lines @@
     return 1;
   }
 
   scoped_refptr<safe_browsing::SignatureUtil> sig_util(
       new safe_browsing::SignatureUtil());
   safe_browsing::ClientDownloadRequest_SignatureInfo signature_info;
   sig_util->CheckSignature(cmd_line->GetSwitchValuePath(kExecutable),
                            &signature_info);
 
   std::string serialized_info = signature_info.SerializeAsString();
-  int bytes_written = file_util::WriteFile(
+  int bytes_written = base::WriteFile(
       cmd_line->GetSwitchValuePath(kOutputFile),
       serialized_info.data(),
       serialized_info.size());
   if (bytes_written != static_cast<int>(serialized_info.size())) {
     LOG(ERROR) << "Error writing output file";
     return 1;
   }
 
   return 0;
 }