Review comments -- added IsSctp()
Review comments -- added IsSctp()

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#8479}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 871b1c373ab2170056ac792bc228ba0e3c3b38b4

sippet/talk,sippet/talk,sippet/talk,sippet/talk,sippet/talk