Significantly reduce the timeout app_jit is given on the buildbot

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 3239 matching lines @@
       var testCaseCompleter =
           new TestCaseCompleter(_graph, testCaseEnqueuer, commandQueue);
       testCaseCompleter.finishedTestCases.listen((TestCase finishedTestCase) {
         resetDebugTimer();
 
         // If we're recording, we don't report any TestCases to listeners.
         if (!recording) {
           eventFinishedTestCase(finishedTestCase);
         }
       }, onDone: () {
-        // Wait until the commandQueue/execturo is done (it may need to stop
+        // Wait until the commandQueue/exectutor is done (it may need to stop
         // batch runners, browser controllers, ....)
         commandQueue.done.then((_) {
           cancelDebugTimer();
           eventAllTestsDone();
         });
       });
 
       resetDebugTimer();
     }
 
@@ skipping 36 matching lines @@
     }
   }
 
   void eventAllTestsDone() {
     for (var listener in _eventListener) {
       listener.allDone();
     }
     _allDone();
   }
 }