Bug 1140586 part 5. Split up js::NewFunction into several different APIs that are more clear in terms of what they do and don't need parents as much. r=waldo

js/src/jsobj.cpp

@@ -2504,14 +2504,7 @@ DefineConstructorAndPrototype(JSContext *cx, HandleObject obj, JSProtoKey key, H
 
         ctor = proto;
     } else {
-        /*
-         * Create the constructor, not using GlobalObject::createConstructor
-         * because the constructor currently must have |obj| as its parent.
-         * (FIXME: remove this dependency on the exact identity of the parent,
-         * perhaps as part of bug 638316.)
-         */
-        RootedFunction fun(cx, NewFunction(cx, constructor, nargs,
-                                           JSFunction::NATIVE_CTOR, obj, atom, ctorKind));
+        RootedFunction fun(cx, NewNativeConstructor(cx, constructor, nargs, atom, ctorKind));
         if (!fun)
             goto bad;