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

tests/html/typed_arrays_range_checks_test.dart

Index: tests/html/typed_arrays_range_checks_test.dart
===================================================================
--- tests/html/typed_arrays_range_checks_test.dart	(revision 14313)
+++ tests/html/typed_arrays_range_checks_test.dart	(working copy)
@@ -2,10 +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('TypedArraysRangeCheckTest');
-#import('../../pkg/unittest/unittest.dart');
-#import('../../pkg/unittest/html_config.dart');
-#import('dart:html');
+library TypedArraysRangeCheckTest;
+import '../../pkg/unittest/lib/unittest.dart';
+import '../../pkg/unittest/lib/html_config.dart';
+import 'dart:html';
 
 main() {
   useHtmlConfiguration();