Fix crashing fake network pipe tests.
Fix crashing fake network pipe tests.

These tests are not included in bots, this will be fixed in a follow-up by pbos@webrtc.org.

R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/13109004

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@6837 4adac7df-926f-26a2-2b94-8c16560cd09d

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