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This CL renames jid_util.* to signaling_id_util.* and renames its
functions from Jid to SignalingId.

Bug: 983282
Change-Id: I94b50afc6b9c33031905e17c5c55ada3d846e9a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1853868Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704827}