Fixing DCHECK in turnport.cc that was broken by refactoring.

"PROTO_TCP + secure bit" was turned into "PROTO_TLS" by this CL:
https://codereview.webrtc.org/2568833002

But a "DCHECK(proto == PROTO_TCP)" wasn't updated to take this into
account.

BUG=NONE
TBR=pthatcher@webrtc.org

Review-Url: https://codereview.webrtc.org/2859763003
Cr-Original-Commit-Position: refs/heads/master@{#18000}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: bbe2a370f79dc868302759430b5e122b5e6953a3
1 file changed