remove {forEach, keys, values, entries } from majority of DOM colle…

…ction prototypes

These appear to be added to address #329. However, only NodeList and
DOMTokenList are documented and tested to have these functions on their
prototypes.

packages/core-js/modules/web.dom-collections.for-each.js

@@ -14,7 +14,9 @@ var handlePrototype = function (CollectionPrototype) {
 };
 
 for (var COLLECTION_NAME in DOMIterables) {
-  handlePrototype(global[COLLECTION_NAME] && global[COLLECTION_NAME].prototype);
+  if (DOMIterables[COLLECTION_NAME]) {
+    handlePrototype(global[COLLECTION_NAME] && global[COLLECTION_NAME].prototype);
+  }
 }
 
 handlePrototype(DOMTokenListPrototype);