Added destructors for tests to control destruct order

TBR=mflodman
Review URL: https://webrtc-codereview.appspot.com/1197005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3667 4adac7df-926f-26a2-2b94-8c16560cd09d
4 files changed