Bug 1140675 - Enable test_bug879717.html on windows. r=jwwang.

MozReview-Commit-ID: Enl9fCqHhYN

--HG--
extra : rebase_source : 2b0345d1e2b2d8cfc31a10057daeef0708492621

dom/media/test/mochitest.ini

@@ -607,7 +607,6 @@ skip-if = (os == 'mac' && os_version == '10.6') # bug 1021174
 [test_bug874897.html]
 [test_bug879717.html]
 tags=capturestream
-skip-if = os == 'win' && !debug # bug 1140675
 [test_bug883173.html]
 [test_bug895091.html]
 tags=webvtt