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The base function is changing to return an RTCError, so we need to stop
overriding the old function.

Bug: 891556
Change-Id: Id9d1a90732a07fa3877f5ce50824d920bacf2777
Reviewed-on: https://chromium-review.googlesource.com/c/1257860Reviewed-by: Henrik Boström <hbos@chromium.org>
Commit-Queue: Florent Castelli <orphis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596242}