Stop timer in ~EventWindows().

Running out of handles seems to have been an issue when adding another
test target, this should solve it.

BUG=
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2339004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4897 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed