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

pkg/polymer/lib/src/instance.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;
 
 /**
  * Use this annotation to publish a field as an attribute. For example:
  *
  *     class MyPlaybackElement extends PolymerElement {
@@ skipping 300 matching lines @@
     // locate nodes with id and store references to them in this.$ hash
     marshalNodeReferences(root);
     // TODO(jmesserly): port this
     // set up pointer gestures
     // PointerGestures.register(root);
   }
 
   /** Locate nodes with id and store references to them in [$] hash. */
   void marshalNodeReferences(Node root) {
     if (root == null) return;
-    for (var n in (root as dynamic).queryAll('[id]')) {
+    for (var n in (root as dynamic).querySelectorAll('[id]')) {
       $[n.id] = n;
     }
   }
 
   void attributeChanged(String name, String oldValue, String newValue) {
     if (name != 'class' && name != 'style') {
       attributeToProperty(name, newValue);
     }
   }
 
@@ skipping 818 matching lines @@
     if (_sub != null) {
       if (_eventsLog.isLoggable(Level.FINE)) {
         _eventsLog.fine(
             'event.remove: [$_node].$_eventName => [$_model].$_path())');
       }
      _sub.cancel();
       _sub = null;
     }
   }
 }