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

tests/html/element_webkit_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('ElementWebKitTest');
-#import('../../pkg/unittest/unittest.dart');
-#import('../../pkg/unittest/html_config.dart');
-#import('dart:html');
+library ElementWebKitTest;
+import '../../pkg/unittest/lib/unittest.dart';
+import '../../pkg/unittest/lib/html_config.dart';
+import 'dart:html';
 
 
 // NOTE:
 // These should ALL be webkit-specific items
 // Ideally all of these should be functional on all browsers and moved into
 // element_test.dart.
 
 void testConstructorHelper(String tag, String htmlSnippet,
     String expectedText, Function isExpectedClass) {
   expect(isExpectedClass(new Element.tag(tag)), true);
@@ skipping 52 matching lines @@
     final on = element.on;
     testEventHelper(on.transitionEnd, 'webkitTransitionEnd');
     testEventHelper(on.fullscreenChange, 'webkitfullscreenchange',
         (listener) => Testing.addEventListener(element,
             'webkitfullscreenchange', listener, true));
   });
 }