Philipp Hancke f79bfc65e5 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}
2020-06-30 13:40:26 +00:00
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