Fix typo in r4765.
Fix typo in r4765.

Fixes compile error on all platforms.

BUG=
TEST=compile on tryboys
R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2231004

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 32d640e03da848c4d724129167720373c6345875

sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc