Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/test/chromedriver/chrome/zip_reader.cc

Index: chrome/test/chromedriver/chrome/zip_reader.cc
diff --git a/chrome/test/chromedriver/chrome/zip_reader.cc b/chrome/test/chromedriver/chrome/zip_reader.cc
index 52bf815052e1d608b405d69720a7fef3c9a77cc8..718aea50d59f9b9039e11d3764a19cfaa0e3619f 100644
--- a/chrome/test/chromedriver/chrome/zip_reader.cc
+++ b/chrome/test/chromedriver/chrome/zip_reader.cc
@@ -272,7 +272,7 @@ bool ZipReader::ExtractCurrentEntryToFd(const int fd) {
     } else if (num_bytes_read > 0) {
       // Some data is read. Write it to the output file descriptor.
       if (num_bytes_read !=
-          file_util::WriteFileDescriptor(fd, buf, num_bytes_read)) {
+          base::WriteFileDescriptor(fd, buf, num_bytes_read)) {
         success = false;
         break;
       }