Revert 11715.

pkg/unittest/dom_config.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.
 
 /** Configuration for running tests in a browser using dart:dom_deprecated. */
 #library('dom_config');
 
 #import('dart:dom_deprecated');
 #import('unittest.dart');
 
@@ skipping 26 matching lines @@
     window.removeEventListener('error', _onErrorClosure);
     _showResultsInPage(passed, failed, errors, results, _isLayoutTest,
         uncaughtError);
     window.postMessage('unittest-suite-done', '*');
   }
 }
 
 void useDomConfiguration([bool isLayoutTest = false]) {
   configure(new DomConfiguration(isLayoutTest));
 }