Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/chromeos/contacts/contact_database_unittest.cc

Index: chrome/browser/chromeos/contacts/contact_database_unittest.cc
diff --git a/chrome/browser/chromeos/contacts/contact_database_unittest.cc b/chrome/browser/chromeos/contacts/contact_database_unittest.cc
index 5bd26c3f3e4b308a2c5e7a35f503c29d05db59a1..8942da0285a479546d900aa79b9111165f3e5281 100644
--- a/chrome/browser/chromeos/contacts/contact_database_unittest.cc
+++ b/chrome/browser/chromeos/contacts/contact_database_unittest.cc
@@ -319,7 +319,7 @@ TEST_F(ContactDatabaseTest, DeleteWhenCorrupt) {
       database_path(), false, base::FileEnumerator::FILES);
   for (base::FilePath path = enumerator.Next(); !path.empty();
        path = enumerator.Next()) {
-    file_util::WriteFile(path, " ", 1);
+    base::WriteFile(path, " ", 1);
   }
   CreateDatabase();