Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/ui/webui/options/certificate_manager_handler.cc

Index: chrome/browser/ui/webui/options/certificate_manager_handler.cc
diff --git a/chrome/browser/ui/webui/options/certificate_manager_handler.cc b/chrome/browser/ui/webui/options/certificate_manager_handler.cc
index 4034c70509b284c7a87b1f31db281921844d9d36..2b7481a67f6609c1e01971b0112bb53fe69ccaed 100644
--- a/chrome/browser/ui/webui/options/certificate_manager_handler.cc
+++ b/chrome/browser/ui/webui/options/certificate_manager_handler.cc
@@ -282,7 +282,7 @@ void FileAccessProvider::DoWrite(const base::FilePath& path,
                                  const std::string& data,
                                  int* saved_errno,
                                  int* bytes_written) {
-  *bytes_written = file_util::WriteFile(path, data.data(), data.size());
+  *bytes_written = base::WriteFile(path, data.data(), data.size());
   *saved_errno = *bytes_written >= 0 ? 0 : errno;
 }