Remove List.copyFrom from VM and from tests. It was removed from the List interface in r941.

lib/dom/src/native_DOMImplementation.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class _Utils {
   static List convertToList(List list) {
     // FIXME: [possible optimization]: do not copy the array if Dart_IsArray is fine w/ it.
     final length = list.length;
     List result = new List(length);
-    result.copyFrom(list, 0, 0, length);
+    result.setRange(0, length, list);
     return result;
   }
 
   static List convertMapToList(Map map) {
     List result = [];
     map.forEach((k, v) => result.addAll([k, v]));
     return result;
   }
 
   static void populateMap(Map result, List list) {
@@ skipping 77 matching lines @@
   void operator []=(String key, String value) native "DOMStringMap_setItem_Callback";
   String putIfAbsent(String key, String ifAbsent()) => Maps.putIfAbsent(this, key, ifAbsent);
   String remove(String key) native "DOMStringMap_remove_Callback";
   void clear() => Maps.clear(this);
   void forEach(void f(String key, String value)) => Maps.forEach(this, f);
   Collection<String> getKeys() native "DOMStringMap_getKeys_Callback";
   Collection<String> getValues() => Maps.getValues(this);
   int get length() => Maps.length(this);
   bool isEmpty() => Maps.isEmpty(this);
 }