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After cl 776197, SessionOptions can be referred by protocol/ and codec/, so we
can use it to forward the session options instead of using pure string for
video codec selection.

This change should have no behavior impact.

Bug: chromium:781432
Change-Id: Id7b87d460a4789dead75806f6f33d731cf8ddada
Reviewed-on: https://chromium-review.googlesource.com/777776
Commit-Queue: Zijie He <zijiehe@chromium.org>
Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517908}