Reverting 7566, which is causing build breakage.

lib/unittest/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.
 
 /** This file is sourced by unitest.dart. */
 
 /**
  * Hooks to configure the unittest library for different platforms. This class
  * implements the API in a platform-independent way. Tests that want to take
  * advantage of the platform can create a subclass and override methods from
@@ skipping 28 matching lines @@
    * When [uncaughtError] is not null, it contains an error that occured outside
    * of tests (e.g. setting up the test).
    */
   void onDone(int passed, int failed, int errors, List<TestCase> results,
       String uncaughtError) {
     // Print each test's result.
     for (final t in _tests) {
       print('${t.result.toUpperCase()}: ${t.description}');
 
       if (t.message != '') {
-        print(_indent(t.message));
-      }
-
-      if (t.stackTrace != null && t.stackTrace != '') {
-        print(_indent(t.stackTrace));
+        print('  ${t.message}');
       }
     }
 
     // Show the summary.
     print('');
 
     var success = false;
     if (passed == 0 && failed == 0 && errors == 0) {
       print('No tests found.');
       // This is considered a failure too: if this happens you probably have a
       // bug in your unit tests.
     } else if (failed == 0 && errors == 0 && uncaughtError == null) {
       print('All $passed tests passed.');
       success = true;
     } else {
       if (uncaughtError != null) {
         print('Top-level uncaught error: $uncaughtError');
       }
       print('$passed PASSED, $failed FAILED, $errors ERRORS');
     }
 
     // An exception is used by the test infrastructure to detect failure.
     if (!success) throw new Exception("Some tests failed.");
   }
-
-  String _indent(String str) {
-    // TODO(nweiz): Use this simpler code once issue 2980 is fixed.
-    // return str.replaceAll(const RegExp("^", multiLine: true), "  ");
-
-    return Strings.join(str.split("\n").map((line) => "  $line"), "\n");
-  }
 }