Remove ambiguous call to MakeCheckOpString.
Remove ambiguous call to MakeCheckOpString.

BUG=3777
R=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/14339004

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 0229cbae3339bfadcf018fa424a7163e02c1a0b7

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