Always use the PF_SRTP_BYPASS when sending RTP/RTCP packets.
Change the condition in BaseChannel::GetSrtpOverhead.
Get the SRTP overhead when using either SDES or DTLS-SRTP.
Bug: None
Change-Id: I44aeff8b75e56b12acefd73299a95a3e38cd401b
Reviewed-on: https://webrtc-review.googlesource.com/6580
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Commit-Queue: Zhi Huang <zhihuang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20152}
04eaa15468