Rearranges the polymer package now that the old compiler is gone.

pkg/polymer/lib/src/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.linter;
 
 import 'dart:io';
 import 'dart:async';
 import 'dart:mirrors';
 import 'dart:convert' show JSON;
 
 import 'package:barback/barback.dart';
 import 'package:html5lib/dom.dart';
 import 'package:html5lib/dom_parsing.dart';
 
-import 'transform/common.dart';
+import 'common.dart';
 
 typedef String MessageFormatter(String kind, String message, Span span);
 
 /**
  * A linter that checks for common Polymer errors and produces warnings to
  * show on the editor or the command line. Leaves sources unchanged, but creates
  * a new asset containing all the warnings.
  */
 class Linter extends Transformer with PolymerTransformer {
   final TransformOptions options;
@@ skipping 404 matching lines @@
  * <https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/custom/index.html#dfn-custom-element-name>
  */
 bool _isCustomTag(String name) {
   if (name == null || !name.contains('-')) return false;
   return !_invalidTagNames.containsKey(name);
 }
 
 final String _RED_COLOR = '\u001b[31m';
 final String _MAGENTA_COLOR = '\u001b[35m';
 final String _NO_COLOR = '\u001b[0m';