Changes to how we handle fancy stacks:

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;
 
 import 'dart:async';
@@ skipping 114 matching lines @@
     }
   }
 
   void processMessage(e) {
     if ('unittest-suite-external-error' == e.data) {
       handleExternalError('<unknown>', '(external error detected)');
     }
   }
 
   void onInit() {
+    var meta = query('meta[name="dart.unittest"]');
+    formatStacks = meta == null ? true :
+       !meta.content.contains('raw-stack-traces');
     _installHandlers();
     window.postMessage('unittest-suite-wait-for-done', '*');
   }
 
   void onStart() {
     // If the URL has a #testFilter=testName then filter tests to that.
     // This is used to make it easy to run a single test- but is only intended
     // for interactive debugging scenarios.
     var hash = window.location.hash;
     if (hash != null && hash.length > 1) {
@@ skipping 19 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);