[polymer] fix editor hints -- query/queryAll and unused imports

pkg/polymer/test/event_path_declarative_test.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.
 
 // This is ported from event-path-declarative-test.dart in polymer/test/html/.
 // While the original test was intended to test event.path support, we changed
 // the test structure just to check that the event was handled in the expected
 // order.
 library polymer.test.event_path_declarative_test;
 
 import 'dart:async';
-import 'dart:collection';
 import 'dart:html';
 
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
 import 'package:polymer/polymer.dart';
-import 'package:template_binding/template_binding.dart';
 
 var _observedEvents = [];
 var _testFired;
 
 main() => initPolymer();
 
 @reflectable
 class XZug extends PolymerElement {
 
   XZug.created() : super.created();
@@ skipping 82 matching lines @@
       var expectedPath = [ xBarContent, xBarDiv, xFooContent,
           xZugContent, xZugDiv, xZug, xFooDiv, xFoo, xBar];
       debugName(e) => '${e.localName}#${e.id}';
       expect(_observedEvents, expectedPath, reason:
         '<br>\nexpected: ${expectedPath.map(debugName).join(',')}'
         '<br>\nactual: ${_observedEvents.map(debugName).join(',')}'
         );
     });
   });
 }