Replace bootstrap logic with 'boot.js', use 'component/dart' mime-type and add

pkg/polymer/example/canonicalization/test/dir/dir2_test.dart

Index: pkg/polymer/example/canonicalization/test/dir/dir2_test.dart
diff --git a/pkg/polymer/example/canonicalization2/lib/b.dart b/pkg/polymer/example/canonicalization/test/dir/dir2_test.dart
similarity index 62%
copy from pkg/polymer/example/canonicalization2/lib/b.dart
copy to pkg/polymer/example/canonicalization/test/dir/dir2_test.dart
index fbdccf604595572141e69ad29d5183be5b811b4f..d4c55dca31f6639252960b0036ba793c80e1ad70 100644
--- a/pkg/polymer/example/canonicalization2/lib/b.dart
+++ b/pkg/polymer/example/canonicalization/test/dir/dir2_test.dart
@@ -2,15 +2,10 @@
 // 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.
 
-library canonicalization.b;
+/// Tests canonicalization at deployment time from a subdir.
+library canonicalization.test.dir2_test;
 
 import 'package:polymer/polymer.dart';
-import 'package:canonicalization/c.dart';
-import 'd.dart';
+import '../common.dart';
 
-int b = 0;
-@initMethod initB() {
-  b++;
-  c++;
-  d++;
-}
+@initMethod main() => tests();