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

samples/tests/samples/lib/observable/observable_test.dart

 // Copyright (c) 2011, 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.
 
-#library('observable_tests');
+library observable_tests;
 
-#import('dart:html');
-#import('../../../../ui_lib/observable/observable.dart');
-#import('../../../../../pkg/unittest/unittest.dart');
-#import('../../../../../pkg/unittest/html_config.dart');
+import 'dart:html';
+import '../../../../ui_lib/observable/observable.dart';
+import '../../../../../pkg/unittest/lib/unittest.dart';
+import '../../../../../pkg/unittest/lib/html_config.dart';
 
-#source('abstract_observable_tests.dart');
-#source('change_event_tests.dart');
-#source('event_batch_tests.dart');
-#source('observable_list_tests.dart');
-#source('observable_value_tests.dart');
+part 'abstract_observable_tests.dart';
+part 'change_event_tests.dart';
+part 'event_batch_tests.dart';
+part 'observable_list_tests.dart';
+part 'observable_value_tests.dart';
 
 void main() {
   useHtmlConfiguration();
   group('AbstractObservable', testAbstractObservable);
   group('ChangeEvent', testChangeEvent);
   group('EventBatch', testEventBatch);
   group('ObservableList', testObservableList);
   group('ObservableValue', testObservableValue);
 }
 
@@ skipping 14 matching lines @@
   validateEvent(e, target, pName, index, ChangeEvent.INSERT, newVal, null);
 }
 
 void validateRemove(ChangeEvent e, target, pName, index, oldVal) {
   validateEvent(e, target, pName, index, ChangeEvent.REMOVE, null, oldVal);
 }
 
 void validateUpdate(ChangeEvent e, target, pName, index, newVal, oldVal) {
   validateEvent(e, target, pName, index, ChangeEvent.UPDATE, newVal, oldVal);
 }