Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/profile_resetter/automatic_profile_resetter_mementos.cc

Index: chrome/browser/profile_resetter/automatic_profile_resetter_mementos.cc
diff --git a/chrome/browser/profile_resetter/automatic_profile_resetter_mementos.cc b/chrome/browser/profile_resetter/automatic_profile_resetter_mementos.cc
index 6bb94e279da7a028834a5424a6538381b399e5e4..101155b2d49b7a4ebac3e4a07682bbbe18747f97 100644
--- a/chrome/browser/profile_resetter/automatic_profile_resetter_mementos.cc
+++ b/chrome/browser/profile_resetter/automatic_profile_resetter_mementos.cc
@@ -120,7 +120,7 @@ void FileHostedPromptMemento::StoreValueOnFileThread(
     const base::FilePath& memento_file_path,
     const std::string& value) {
   int retval =
-      file_util::WriteFile(memento_file_path, value.c_str(), value.size());
+      base::WriteFile(memento_file_path, value.c_str(), value.size());
   DCHECK_EQ(retval, (int)value.size());
 }