Switch polymer's build.dart to use the new linter. This CL does the following

pkg/polymer/lib/src/transform/import_inliner.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.
 
 /** Transfomer that inlines polymer-element definitions from html imports. */
 library polymer.src.transform.import_inliner;
 
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 import 'package:path/path.dart' as path;
 import 'package:html5lib/dom.dart' show Document, Node, DocumentFragment;
 import 'package:html5lib/dom_parsing.dart' show TreeVisitor;
 import 'common.dart';
 
 /** Recursively inlines polymer-element definitions from html imports. */
 // TODO(sigmund): make sure we match semantics of html-imports for tags other
 // than polymer-element (see dartbug.com/12613).
-class ImportedElementInliner extends Transformer {
+class ImportedElementInliner extends Transformer with PolymerTransformer {
+  final TransformOptions options;
+
+  ImportedElementInliner(this.options);
+
   /** Only run on entry point .html files. */
   Future<bool> isPrimary(Asset input) =>
-      new Future.value(isPrimaryHtml(input.id));
+      new Future.value(options.isHtmlEntrypoint(input.id));
 
   Future apply(Transform transform) {
     var seen = new Set<AssetId>();
     var elements = [];
     var id = transform.primaryInput.id;
     seen.add(id);
     return readPrimaryAsHtml(transform).then((document) {
       var future = _visitImports(document, id, transform, seen, elements);
       return future.then((importsFound) {
         if (!importsFound) {
@@ skipping 126 matching lines @@
   'cite',       // in blockquote, del, ins, q
   'data',       // in object
   'formaction', // in button, input
   'href',       // in a, area, link, base, command
   'icon',       // in command
   'manifest',   // in html
   'poster',     // in video
   'src',        // in audio, embed, iframe, img, input, script, source, track,
                 //    video
 ];