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

utils/tests/pub/test_pub.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Test infrastructure for testing pub. Unlike typical unit tests, most pub
  * tests are integration tests that stage some stuff on the file system, run
  * pub, and then validate the results. This library provides an API to build
  * tests like that.
  */
 library test_pub;
 
 import 'dart:io';
 import 'dart:isolate';
 import 'dart:json';
 import 'dart:math';
 import 'dart:uri';
 
-import '../../../pkg/unittest/unittest.dart';
+import '../../../pkg/unittest/lib/unittest.dart';
 import '../../lib/file_system.dart' as fs;
 import '../../pub/git_source.dart';
 import '../../pub/hosted_source.dart';
 import '../../pub/io.dart';
 import '../../pub/sdk_source.dart';
 import '../../pub/utils.dart';
 import '../../pub/yaml/yaml.dart';
 
 /**
  * Creates a new [FileDescriptor] with [name] and [contents].
@@ skipping 1185 matching lines @@
 }
 
 /**
  * Schedules a callback to be called after Pub is run with [runPub], even if it
  * fails.
  */
 void _scheduleCleanup(_ScheduledEvent event) {
   if (_scheduledCleanup == null) _scheduledCleanup = [];
   _scheduledCleanup.add(event);
 }