Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/ui/certificate_dialogs.cc

Index: chrome/browser/ui/certificate_dialogs.cc
diff --git a/chrome/browser/ui/certificate_dialogs.cc b/chrome/browser/ui/certificate_dialogs.cc
index cb32713de0bf104f4552cad750c59b2c32c37429..0712dd7866138c93bda22b8d666b4335eda0d660 100644
--- a/chrome/browser/ui/certificate_dialogs.cc
+++ b/chrome/browser/ui/certificate_dialogs.cc
@@ -25,7 +25,7 @@ using content::WebContents;
 namespace {
 
 void WriterCallback(const base::FilePath& path, const std::string& data) {
-  int bytes_written = file_util::WriteFile(path, data.data(), data.size());
+  int bytes_written = base::WriteFile(path, data.data(), data.size());
   if (bytes_written != static_cast<ssize_t>(data.size())) {
     LOG(ERROR) << "Writing " << path.value() << " ("
                << data.size() << "B) returned " << bytes_written;