Move error message makers off js builtins object.

src/js/harmony-reflect.js

Index: src/js/harmony-reflect.js
diff --git a/src/js/harmony-reflect.js b/src/js/harmony-reflect.js
index 76effa1e3fd833a8c2d6b646be2a27b16a197b84..bbca0fef618ac5bd917239ff5a070ef94c3f6cfb 100644
--- a/src/js/harmony-reflect.js
+++ b/src/js/harmony-reflect.js
@@ -8,10 +8,20 @@
 
 %CheckIsBootstrapping();
 
+// -------------------------------------------------------------------
+// Imports
+
 var GlobalReflect = global.Reflect;
+var MakeTypeError;
 var ReflectApply = utils.ImportNow("reflect_apply");
 var ReflectConstruct = utils.ImportNow("reflect_construct");
 
+utils.Import(function(from) {
+  MakeTypeError = from.MakeTypeError;
+});
+
+// -------------------------------------------------------------------
+
 function ReflectEnumerate(obj) {
   if (!IS_SPEC_OBJECT(obj))
     throw MakeTypeError(kCalledOnNonObject, "Reflect.enumerate")