Unreviewed. Fix for webkitpy tests.

* Scripts/webkitpy/tool/steps/runtests.py:
(RunTests.run):
* Scripts/webkitpy/tool/steps/runtests_unittest.py:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141671 268f45cc-cd09-0410-ab3c-d52691b4dbfc