Loosen the restrictions for ice-char by allowing
'-' and '='. Being spec-compliant breaks interoperability.
The spec-behaviour will be restored with a notice period.
BUG=chromium:1053756,chromium:1044521
No-Try: True
Change-Id: I880babd0869302bd713912ddfcfa48866fad32c1
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168820
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30560}
48e849f569