mac: Prepare most test code for -Wunused-functions too.

chrome/test/chromedriver/element_util.cc

Index: chrome/test/chromedriver/element_util.cc
diff --git a/chrome/test/chromedriver/element_util.cc b/chrome/test/chromedriver/element_util.cc
index b765dddac6dbf4b60785f3450ca5d262df51fc20..ec0c962fe675e737c8d397aae9d1c6184ebb5e15 100644
--- a/chrome/test/chromedriver/element_util.cc
+++ b/chrome/test/chromedriver/element_util.cc
@@ -47,13 +47,6 @@ bool ParseFromValue(base::Value* value, WebSize* size) {
   return true;
 }
 
-base::Value* CreateValueFrom(const WebSize& size) {
-  base::DictionaryValue* dict = new base::DictionaryValue();
-  dict->SetInteger("width", size.width);
-  dict->SetInteger("height", size.height);
-  return dict;
-}
-
 bool ParseFromValue(base::Value* value, WebRect* rect) {
   base::DictionaryValue* dict_value;
   if (!value->GetAsDictionary(&dict_value))