Mark unittest_test as flaky

pkg/pkg.status

 # 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.
 
 # Run this test manually to verify that the fixnum library produces
 # the same results as native ints on a set of directed and random inputs.
 # Skip it when running automated tests because it times out.  This
 # test only makes sense on runtimes that support 64-bit integer
 # arithmetic natively, i.e., the VM.
 fixnum/test/int_64_vm_test: Skip
@@ skipping 106 matching lines @@
 [ $compiler == dart2js && $runtime == drt ]
 intl/test/date_time_format_uninitialized_test: Pass, Fail # http://dartbug.com/9000
 
 [ $compiler == dart2js && $minified ]
 # The unittest package relies on getting the original (non-minified) method
 # names in InvocationMirrors.  You can't get that when minifying.
 unittest/test/mock_test: Fail
 unittest/test/mock_regexp_negative_test: Fail
 
 [ $compiler == dart2js && $csp && $runtime == drt ]
-unittest/test/unittest_test: Fail, Crash # Bug in v8, http://dartbug.com/9407
+unittest/test/unittest_test: Pass, Fail, Crash # Bug in v8, http://dartbug.com/9407
 
 [ $compiler == none && $runtime == drt ]
 dartdoc/test/dartdoc_test: Skip # See dartbug.com/4541.
 
 [ $arch == arm ]
 *: Skip
 
 [ $arch == simarm ]
 *: Skip
 
 [ $arch == mips ]
 *: Skip
 
 [ $arch == simmips ]
 *: Skip
 
 # Skip serialization test that explicitly has no library declaration in the
 # test on Dartium, which requires all tests to have a library.
 [ $runtime == dartium || $runtime == drt ]
 serialization/test/no_library_test: Skip # Expected Failure