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

pkg/unittest/lib/html_layout_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.
 
 /**
  * A configuration for running layoutr tests with testrunner.
  * This configuration is similar to the interactive_html_config
  * as it runs each test in its own IFrame. However, where the former
  * recreated the IFrame for each test, here the IFrames are preserved.
  * Furthermore we post a message on completion.
  */
-#library('html_layout_config');
+library html_layout_config;
 
-#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. */
 // TODO(gram) At some point postMessage was supposed to support
 // sending arrays and maps. When it does we can get rid of the encoding/
 // decoding of messages as string.
 class _Message {
   static final START = 'start';
   static final LOG = 'log';
   static final STACK = 'stack';
   static final PASS = 'pass';
@@ skipping 274 matching lines @@
  */
 void useHtmlLayoutConfiguration() {
   if (window.location.search == '') { // This is the parent.
     _prepareDom();
     configure(new ParentHtmlConfiguration());
   } else {
     configure(new ChildHtmlConfiguration());
   }
 }