test.dart: typo on the batched execution used in safari/ie tests

tools/testing/dart/test_runner.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.
 
 /**
  * Classes and methods for executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 132 matching lines @@
    */
   int numRetries;
 
   BrowserTestCase(displayName, commands, configuration, completedHandler,
       expectedOutcomes, [isNegative = false])
     : super(displayName, commands, configuration, completedHandler,
         expectedOutcomes, isNegative) {
     numRetries = 2; // Allow two retries to compensate for flaky browser tests.
   }
 
-  List<String> get _lastArguments() => command.last().arguments;
+  List<String> get _lastArguments() => commands.last().arguments;
 
   List<String> get batchRunnerArguments() => [_lastArguments[0], '--batch'];
 
   List<String> get batchTestArguments() =>
       _lastArguments.getRange(1, _lastArguments.length - 1);
 }
 
 
 /**
  * TestOutput records the output of a completed test: the process's exit code,
@@ skipping 611 matching lines @@
         // the developer doesn't waste his or her time trying to fix a bunch of
         // tests that appear to be broken but were actually just flakes that
         // didn't get retried because there had already been one failure.
         bool allowRetry = _MAX_FAILED_NO_RETRY > _progress.numFailedTests;
         new RunningProcess(test, allowRetry, this).start();
       }
       _numProcesses++;
     }
   }
 }