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

pkg/intl/test/find_default_locale_browser_test.dart

Index: pkg/intl/test/find_default_locale_browser_test.dart
===================================================================
--- pkg/intl/test/find_default_locale_browser_test.dart	(revision 14313)
+++ pkg/intl/test/find_default_locale_browser_test.dart	(working copy)
@@ -2,11 +2,11 @@
 // 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('find_default_locale_browser_test');
+library find_default_locale_browser_test;
 
-#import('../lib/intl.dart');
-#import('../lib/intl_browser.dart');
-#import('../../unittest/unittest.dart');
+import '../lib/intl.dart';
+import '../lib/intl_browser.dart';
+import '../../../pkg/unittest/lib/unittest.dart';
 
 main() {
   test("Find system locale in browser", () {