fix barback and polymer build warnings

pkg/polymer/lib/src/build/linter.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.
 
 /**
  * Logic to validate that developers are correctly using Polymer constructs.
  * This is mainly used to produce warnings for feedback in the editor.
  */
 library polymer.src.build.linter;
 
@@ skipping 65 matching lines @@
 
   Future _readAndCollectElements(AssetId id, Transform transform,
       Set<AssetId> seen, Map<String, _ElementSummary> elements) {
     if (id == null || seen.contains(id)) return new Future.value(null);
     seen.add(id);
     return readAsHtml(id, transform).then(
         (doc) => _collectElements(doc, id, transform, seen, elements));
   }
 
   Future<List<AssetId>> _getImportedIds(
-      Document document, AssetId sourceId, Tranform transform) {
+      Document document, AssetId sourceId, Transform transform) {
     var importIds = [];
     var logger = transform.logger;
     for (var tag in document.queryAll('link')) {
       if (tag.attributes['rel'] != 'import') continue;
       var href = tag.attributes['href'];
       var span = tag.sourceSpan;
       var id = resolve(sourceId, href, logger, span);
       if (id == null ||
           (id.package == 'polymer' && id.path == 'lib/init.html')) continue;
       importIds.add(assetExists(id, transform).then((exists) {
@@ skipping 149 matching lines @@
          super.visitElement(node);
          break;
     }
   }
 
   void run(Document doc) {
     visit(doc);
 
     if (_isEntrypoint && !_dartTagSeen) {
       _logger.error(USE_INIT_DART, span: doc.body.sourceSpan);
-    } 
+    }
 
     if (_isEntrypoint && !_dartJSSeen) {
       // TODO(sigmund): remove this when webkitStartDart is gone.
       _logger.error(USE_DART_JS, span: doc.body.sourceSpan);
     }
   }
 
   /** Produce warnings for invalid link-rel tags. */
   void _validateLinkElement(Element node) {
     var rel = node.attributes['rel'];
@@ skipping 267 matching lines @@
  */
 bool _isCustomTag(String name) {
   if (name == null || !name.contains('-')) return false;
   return !_invalidTagNames.containsKey(name);
 }
 
 const String _RED_COLOR = '\u001b[31m';
 const String _MAGENTA_COLOR = '\u001b[35m';
 const String _NO_COLOR = '\u001b[0m';
 
-const String USE_INIT_DART = 
+const String USE_INIT_DART =
     'To run a polymer applications, you need to call "initPolymer". You can '
     'either include a generic script tag that does this for you:'
     '\'<script type="application/dart">import "package:polymer/init.dart";'
     '</script>\' or add your own script tag and call that function. '
     'Make sure the script tag is placed after all HTML imports.';
 
 const String USE_DART_JS =
     'To run a polymer applications in Dartium, make sure to include'
     '\'<script src="packages/browser/dart.js"></script>\' in your page';
 
-const String BOOT_JS_DEPRECATED = 
+const String BOOT_JS_DEPRECATED =
     '"boot.js" is now deprecated. Instead, you can initialize your polymer '
     'application by calling "initPolymer()" in your main. If you don\'t have a '
     'main, then you can include our generic main by adding the following '
     'script tag to your page: \'<script type="application/dart">import '
     '"package:polymer/init.dart";</script>\'. Additionally you need to '
     'include: \'<script src="packages/browser/dart.js"></script>\' in the page '
     'too. Make sure these script tags come after all HTML imports.';