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

pkg/unittest/lib/interactive_html_config.dart

 // Copyright (c) 2012, 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.
 
 /**
  * This configuration can be used to rerun selected tests, as well
  * as see diagnostic output from tests. It runs each test in its own
  * IFrame, so the configuration consists of two parts - a 'parent'
  * config that manages all the tests, and a 'child' config for the
  * IFrame that runs the individual tests.
  */
-#library('unittest_interactive_html_config');
+library unittest_interactive_html_config;
 
 // TODO(gram) - add options for: remove IFrame on done/keep
 // IFrame for failed tests/keep IFrame for all tests.
 
-#import('dart:html');
-#import('dart:math');
-#import('unittest.dart');
+import 'dart:html';
+import 'dart:math';
+import 'unittest.dart';
 
 /** The messages exchanged between parent and child. */
 
 class _Message {
   static const START = 'start';
   static const LOG = 'log';
   static const STACK = 'stack';
   static const PASS = 'pass';
   static const FAIL = 'fail';
   static const ERROR = 'error';
@@ skipping 634 matching lines @@
 display: block;
 list-style-type: disc;
 -webkit-margin-before: 1em;
 -webkit-margin-after: 1em;
 -webkit-margin-start: 0px;
 -webkit-margin-end: 0px;
 -webkit-padding-start: 40px;
 }
 
   """;