Restructure pkg/unittest and pkg/webdriver to follow the pub conventions.

tests/json/json_test.dart

Index: tests/json/json_test.dart
===================================================================
--- tests/json/json_test.dart	(revision 14440)
+++ tests/json/json_test.dart	(working copy)
@@ -2,13 +2,12 @@
 // 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('json_tests');
+library json_tests;
+import 'dart:json';
+import 'dart:html';
+import '../../pkg/unittest/lib/unittest.dart';
+import '../../pkg/unittest/lib/html_config.dart';
 
-#import('dart:json');
-#import('dart:html');
-#import('../../pkg/unittest/unittest.dart');
-#import('../../pkg/unittest/html_config.dart');
-
 main() {
   useHtmlConfiguration();
   test('Parse', () {