Bug 1522465 - Part 2: Don't resolve properties on the global object when ClassSpec::DontDefineConstructor is set. r=jorendorff

js/src/jsapi.cpp

@@ -872,7 +872,8 @@ JS_PUBLIC_API bool JS_ResolveStandardClass(JSContext* cx, HandleObject obj,
   JSProtoKey key = stdnm ? stdnm->key : JSProto_Null;
   if (key != JSProto_Null) {
     const Class* clasp = ProtoKeyToClass(key);
-    if (!clasp || !(clasp->flags & JSCLASS_IS_ANONYMOUS)) {
+    if (!clasp || (!(clasp->flags & JSCLASS_IS_ANONYMOUS) &&
+                   clasp->specShouldDefineConstructor())) {
       if (!GlobalObject::ensureConstructor(cx, global, key)) {
         return false;
       }