Update utils to new library syntax.

utils/tests/template/test_with.dart

 // Sample for #with templates:
 //
 //       productview.tmpl
 //       productview2.tmpl
 
 
-#import('dart:html');
-#source('productview.dart');
+import 'dart:html';
+part 'productview.dart';
 
 class Person {
   String name;
   int age;
 
   Person(this.name, this.age);
 }
 
 void main() {
   // Simple template.
   Person person = new Person("Terry Lucas", 52);
   ProductView view = new ProductView(person);
   document.body.elements.add(view.root);
 }