9b5f96e6a28ba7bf98a2b70b54ae14eb0a550156

These checks would help catching double-deletes, forgetting to destroy streams and also catch if VideoEngine has held on to any stale references. BUG=1788 R=stefan@webrtc.org Review URL: https://webrtc-codereview.appspot.com/42929004 Cr-Commit-Position: refs/heads/master@{#8866}
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