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This attempts to fix various failures in https://crbug.com/999136 due to
our browser tests expecting non-standard stats even after
chrome://webrtc-internals/ was updated to use standard getStats() by
default.

Bug: 999136, 1004239
Change-Id: Ia22ab8ab36213253801109a23b43838ffa24dc8f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1806677Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696780}