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

tests/html/svgelement_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('SVGElementTest');
-#import('../../pkg/unittest/unittest.dart');
-#import('../../pkg/unittest/html_config.dart');
-#import('dart:html');
+library SVGElementTest;
+import '../../pkg/unittest/lib/unittest.dart';
+import '../../pkg/unittest/lib/html_config.dart';
+import 'dart:html';
 
 main() {
   useHtmlConfiguration();
 
   var isSVGSVGElement =
       predicate((x) => x is SVGSVGElement, 'is a SVGSVGElement');
 
   Collection<String> _nodeStrings(Collection<Node> input) {
     final out = new List<String>();
     for (Node n in input) {
@@ skipping 164 matching lines @@
       expect(_nodeStrings(el.elements), ["circle", "path"]);
     });
 
     test('set', () {
       final el = new SVGSVGElement();
       el.elements = [new SVGElement.tag("circle"), new SVGElement.tag("path")];
       expect(el.innerHTML, '<circle></circle><path></path>');
     });
   });
 }