Fixing some of the tests disabled from the chrome IDL roll.

tools/dom/templates/html/impl/impl_Range.darttemplate

 // 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.
 
 // WARNING: Do not edit - generated code.
 
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
+  factory $CLASSNAME() => document.$dom_createRange();
 $!MEMBERS
 
   /**
    * Checks if createContextualFragment is supported.
    *
    * See also:
    *
    * * [createContextualFragment]
    */
 $if DART2JS
   static bool get supportsCreateContextualFragment =>
       JS('bool', '("createContextualFragment" in window.Range.prototype)');
 $else
   static bool get supportsCreateContextualFragment => true;
 $endif
 }