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

pkg/unittest/lib/html_enhanced_config.dart

Index: pkg/unittest/lib/html_enhanced_config.dart
===================================================================
--- pkg/unittest/lib/html_enhanced_config.dart	(revision 0)
+++ pkg/unittest/lib/html_enhanced_config.dart	(working copy)
@@ -8,12 +8,11 @@
  * Provides enhanced HTML output with collapsible group headers
  * and other at-a-glance information about the test results.
  */
-#library('unittest_html_enhanced_config');
+library unittest_html_enhanced_config;
 
-#import('dart:html');
-#import('unittest.dart');
+import 'dart:html';
+import 'unittest.dart';
 
-
 class HtmlEnhancedConfiguration extends Configuration {
   /** Whether this is run within dartium layout tests. */
   final bool _isLayoutTest;