Move error message makers off js builtins object.

src/js/string-iterator.js

Index: src/js/string-iterator.js
diff --git a/src/js/string-iterator.js b/src/js/string-iterator.js
index 214f95d9baadb67dcf8a83bc65c4e453718c81cf..ece207cd742ac9dd3fe8725ab51fd27ceabfba2e 100644
--- a/src/js/string-iterator.js
+++ b/src/js/string-iterator.js
@@ -14,12 +14,17 @@
 var GlobalString = global.String;
 var IteratorPrototype = utils.ImportNow("IteratorPrototype");
 var iteratorSymbol = utils.ImportNow("iterator_symbol");
+var MakeTypeError;
 var stringIteratorIteratedStringSymbol =
     utils.ImportNow("string_iterator_iterated_string_symbol");
 var stringIteratorNextIndexSymbol =
     utils.ImportNow("string_iterator_next_index_symbol");
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
+utils.Import(function(from) {
+  MakeTypeError = from.MakeTypeError;
+});
+
 // -------------------------------------------------------------------
 
 function StringIterator() {}