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This resolves the onIceConnectionStateComplete probmise when
iceConnectionState reaches either 'connected' or 'completed' and fixes
the race if it had already reached these states before the function was
called.

This fix is speculative. I am no longer able to repro the TIMEOUT
locally with or without the fix.

Bug: 829401
Change-Id: I1dec90250d640d93498c59a932ab5e84a3b96f15
Reviewed-on: https://chromium-review.googlesource.com/1012029Reviewed-by: Harald Alvestrand <hta@chromium.org>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550580}