call shimStyling even if we have no template, because our extendee might have one

pkg/polymer/lib/src/declaration.dart

 // Copyright (c) 2013, 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.
 
 part of polymer;
 
 /// *Warning* this class is experimental and subject to change.
 ///
 /// The data associated with a polymer-element declaration, if it is backed
 /// by a Dart class instead of a JavaScript prototype.
@@ skipping 474 matching lines @@
 
 /// track document.register'ed tag names and their declarations
 final Map _declarations = new Map<String, PolymerDeclaration>();
 
 bool _isRegistered(String name) => _declarations.containsKey(name);
 PolymerDeclaration _getDeclaration(String name) => _declarations[name];
 
 /// Using Polymer's platform/src/ShadowCSS.js passing the style tag's content.
 void _shimShadowDomStyling(DocumentFragment template, String name,
     String extendee) {
-  if (template == null || _ShadowCss == null ||!_hasShadowDomPolyfill) return;
+  if (_ShadowCss == null ||!_hasShadowDomPolyfill) return;
 
   _ShadowCss.callMethod('shimStyling', [template, name, extendee]);
 }
 
 final bool _hasShadowDomPolyfill = js.context.hasProperty('ShadowDOMPolyfill');
 final JsObject _ShadowCss = _Platform != null ? _Platform['ShadowCSS'] : null;
 
 const _STYLE_SELECTOR = 'style';
 const _SHEET_SELECTOR = 'link[rel=stylesheet]';
 const _STYLE_GLOBAL_SCOPE = 'global';
@@ skipping 40 matching lines @@
 bool _isObserverMethod(Symbol symbol) {
   String name = smoke.symbolToName(symbol);
   if (name == null) return false;
   return name.endsWith('Changed') && name != 'attributeChanged';
 }
 
 
 final _ATTRIBUTES_REGEX = new RegExp(r'\s|,');
 
 final JsObject _Platform = js.context['Platform'];