Renaming unittest library names to all have package prefix names.

pkg/unittest/lib/html_config.dart

 // Copyright (c) 2013, 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 simple unit test library for running tests in a browser.
  */
-library unittest_html_config;
+library unittest.html_config;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:html';
 import 'dart:js' as js;
 import 'unittest.dart';
 
 /** Creates a table showing tests results in HTML. */
 void _showResultsInPage(int passed, int failed, int errors,
     List<TestCase> results, bool isLayoutTest, String uncaughtError) {
@@ skipping 150 matching lines @@
     window.postMessage('unittest-suite-done', '*');
   }
 }
 
 void useHtmlConfiguration([bool isLayoutTest = false]) {
   unittestConfiguration = isLayoutTest ? _singletonLayout : _singletonNotLayout;
 }
 
 final _singletonLayout = new HtmlConfiguration(true);
 final _singletonNotLayout = new HtmlConfiguration(false);