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Plan-B is deprecated, but some non-trivial work is needed to update to
Unified Plan. Specifying Plan-B explicitly will keep things working
when WebRTC changes the default to Unified Plan.

Bug: 903012
Change-Id: I3afc86c87f79af068f93af384cc20229293be5c5
Reviewed-on: https://chromium-review.googlesource.com/c/1327546Reviewed-by: Joe Downing <joedow@chromium.org>
Commit-Queue: Lambros Lambrou <lambroslambrou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607312}