Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/feedback/feedback_util.cc

Index: chrome/browser/feedback/feedback_util.cc
diff --git a/chrome/browser/feedback/feedback_util.cc b/chrome/browser/feedback/feedback_util.cc
index 33eabe4f36fd407ee1cd24ed663d5589d5926423..75a85a6558cae8b390c52ed64d19472b52775faf 100644
--- a/chrome/browser/feedback/feedback_util.cc
+++ b/chrome/browser/feedback/feedback_util.cc
@@ -255,8 +255,8 @@ bool ZipString(const base::FilePath& filename,
   // another temporary file to receive the zip file in.
   if (!base::CreateNewTempDirectory(base::FilePath::StringType(), &temp_path))
     return false;
-  if (file_util::WriteFile(temp_path.Append(filename),
-                           data.c_str(), data.size()) == -1)
+  if (base::WriteFile(temp_path.Append(filename), data.c_str(), data.size()) ==
+      -1)
     return false;
 
   bool succeed = base::CreateTemporaryFile(&zip_file) &&