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

samples/tests/samples/lib/view/view_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('view_tests');
+library view_tests;
 
-#import('dart:html');
-#import('../../../../ui_lib/base/base.dart');
-#import('../../../../ui_lib/view/view.dart');
-#import('../../../../../pkg/unittest/unittest.dart');
-#import('../../../../../pkg/unittest/html_config.dart');
+import 'dart:html';
+import '../../../../ui_lib/base/base.dart';
+import '../../../../ui_lib/view/view.dart';
+import '../../../../../pkg/unittest/lib/unittest.dart';
+import '../../../../../pkg/unittest/lib/html_config.dart';
 
 void main() {
   useHtmlConfiguration();
   test('does not render immediately', () {
     final view = new TestView();
     expect(view.isRendered, isFalse);
 
     view.addToDocument(document.body);
     expect(view.isRendered, isTrue);
   });
@@ skipping 174 matching lines @@
     afterRenderFn = (node) {};
     enterDocumentFn = () {};
     exitDocumentFn = () {};
   }
 
   Element render() => renderFn();
   void afterRender(Element node) { afterRenderFn(node); }
   void enterDocument() { enterDocumentFn(); }
   void exitDocument() { exitDocumentFn(); }
 }