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

lib/dom/templates/html/impl/impl_DocumentFragment.darttemplate

Index: lib/dom/templates/html/impl/impl_DocumentFragment.darttemplate
diff --git a/lib/dom/templates/html/impl/impl_DocumentFragment.darttemplate b/lib/dom/templates/html/impl/impl_DocumentFragment.darttemplate
index 98132b716818fd61c3666055d86fdfb3b215f39f..cf00fbc3fcfc39126808435f3b014fc3603e7345 100644
--- a/lib/dom/templates/html/impl/impl_DocumentFragment.darttemplate
+++ b/lib/dom/templates/html/impl/impl_DocumentFragment.darttemplate
@@ -60,10 +60,6 @@ class FilteredElementList implements ElementList {
     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 rangeLength, List from, [int startFrom = 0]) {
     throw const NotImplementedException();
   }