Disable WebrtcBrowserTest.CanForwardRemoteStream on windows

BUG=304775
TBR=tommi@chromium.org

Review URL: https://codereview.chromium.org/26226002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227256 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227256