Remove Dartium support from test.dart.

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 1326 matching lines @@
         }
 
         decodeOutput();
         if (stdout.any(containsOutOfMemoryMessage) ||
             stderr.any(containsOutOfMemoryMessage)) {
           return true;
         }
       }
     }
 
-    // We currently rerun dartium tests, see issue 14074.
-    if (command is BrowserTestCommand &&
-        command.retry &&
-        command.browser == Runtime.dartium) {
-      return true;
-    }
-
     // As long as we use a legacy version of our custom content_shell (which
     // became quite flaky after chrome-50 roll) we'll re-run tests on it.
     // The plan is to use chrome's content_shell instead of our own.
     // See http://dartbug.com/29655 .
     if (command is ContentShellCommand) {
       return true;
     }
 
     if (io.Platform.operatingSystem == 'linux') {
       decodeOutput();
@@ skipping 278 matching lines @@
     }
   }
 
   void eventAllTestsDone() {
     for (var listener in _eventListener) {
       listener.allDone();
     }
     _allDone();
   }
 }