fix analysis issue caught by dart2js bots

sdk/lib/html/dart2js/html_dart2js.dart

 /// The Dart HTML library.
 ///
 /// For examples, see
 /// [Dart HTML5 Samples](https://github.com/dart-lang/dart-html5-samples)
 /// on Github.
 library dart.dom.html;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_collection-dev' hide Symbol;
@@ skipping 16388 matching lines @@
   }
 
   /** Unbinds all bound attributes. */
   @Experimental
   void unbindAll() {
     TemplateElement.mdvPackage(this).unbindAll();
   }
 
   /** Gets the template instance that instantiated this node, if any. */
   @Experimental
-  TemplateInstance get templateInstance => mdvPackage(this).templateInstance;
+  TemplateInstance get templateInstance =>
+      TemplateElement.mdvPackage(this).templateInstance;
 
 
   @DomName('Node.ATTRIBUTE_NODE')
   @DocsEditable
   static const int ATTRIBUTE_NODE = 2;
 
   @DomName('Node.CDATA_SECTION_NODE')
   @DocsEditable
   static const int CDATA_SECTION_NODE = 4;
 
@@ skipping 12342 matching lines @@
       _position = nextPosition;
       return true;
     }
     _current = null;
     _position = _array.length;
     return false;
   }
 
   T get current => _current;
 }