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

lib/html/src/DocumentFragmentWrappingImplementation.dart

 // Copyright (c) 2011, 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 FilteredElementList implements ElementList {
   final Node _node;
   final NodeList _childNodes;
 
   FilteredElementList(Node node): _childNodes = node.nodes, _node = node;
 
@@ skipping 42 matching lines @@
   }
 
   void addLast(Element value) {
     add(value);
   }
 
   void sort(int compare(Element a, Element b)) {
     throw const UnsupportedOperationException('TODO(jacobr): should we impl?');
   }
 
-  void copyFrom(List<Object> src, int srcStart, int dstStart, int count) {
-    throw const NotImplementedException();
-  }
-
   void setRange(int start, int length, List from, [int startFrom = 0]) {
     throw const NotImplementedException();
   }
 
   void removeRange(int start, int length) {
     _filtered.getRange(start, length).forEach((el) => el.remove());
   }
 
   void insertRange(int start, int length, [initialValue = null]) {
     throw const NotImplementedException();
@@ skipping 310 matching lines @@
       "Title can't be set for document fragments.");
   }
 
   void set webkitdropzone(String value) {
     throw new UnsupportedOperationException(
       "WebKit drop zone can't be set for document fragments.");
   }
 
   DocumentFragment clone(bool deep) => super.clone(deep);
 }