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

pkg/polymer/lib/src/loader.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;
 
 /** Annotation used to automatically register polymer elements. */
 class CustomTag {
   final String tagName;
   const CustomTag(this.tagName);
@@ skipping 109 matching lines @@
   if (seen == null) seen = new Set<Document>();
   if (scripts == null) scripts = <String>[];
   if (doc == null) {
     print('warning: $baseUri not found.');
     return scripts;
   }
   if (seen.contains(doc)) return scripts;
   seen.add(doc);
 
   bool scriptSeen = false;
-  for (var node in doc.queryAll('script,link[rel="import"]')) {
+  for (var node in doc.querySelectorAll('script,link[rel="import"]')) {
     if (node is LinkElement) {
       _discoverScripts(node.import, node.href, seen, scripts);
     } else if (node is ScriptElement && node.type == 'application/dart') {
       if (!scriptSeen) {
         var url = node.src;
         scripts.add(url == '' ? baseUri : url);
         scriptSeen = true;
       } else {
         print('warning: more than one Dart script tag in $baseUri. Dartium '
             'currently only allows a single Dart script tag per document.');
@@ skipping 97 matching lines @@
     print("warning: methods marked with @initMethod should take no "
         "arguments, ${method.simpleName} expects some.");
     return;
   }
   initializers.add(() => obj.invoke(method.simpleName, const []));
 }
 
 class _InitMethodAnnotation {
   const _InitMethodAnnotation();
 }