Enable tests for Windows EWS!
https://bugs.webkit.org/show_bug.cgi?id=107968

Reviewed by Adam Barth.

* Scripts/webkitpy/tool/commands/earlywarningsystem.py:
(WinEWS):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141205 268f45cc-cd09-0410-ab3c-d52691b4dbfc