WebRTCDemo: move the deletion of CritSect to end of the dtor to fix a crash in Android video renderer.

BUG=3368
TEST=Manual Test

Review URL: https://webrtc-codereview.appspot.com/21519005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6220 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed