This reverts commit f79bfc65e52a35d27cf0db2d212e94043fb44da3.
Reason for revert: Potentially affects Chromium tests, see
failures on https://chromium-review.googlesource.com/c/chromium/src/+/2276338.
Original change's description:
> peerconnection: prefer spec names for signaling state
>
> Map the internal state names to the spec ones defined in
> https://w3c.github.io/webrtc-pc/#rtcsignalingstate-enum
> instead of exposing them. This only affects the (not specified)
> error strings.
>
> Bug: None
> Change-Id: Ib0b35bb3106b1688e8386f6fdd0b8c7fdebaf1dc
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/178390
> Reviewed-by: Henrik Boström <hbos@webrtc.org>
> Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
> Cr-Commit-Position: refs/heads/master@{#31591}
TBR=hbos@webrtc.org,philipp.hancke@googlemail.com
# Not skipping CQ checks because original CL landed > 1 day ago.
Bug: None
Change-Id: I6df20c93f6944b819eb11f22ba30c6221de61d79
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/178560
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31610}
58e64bbf3b