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These interfaces have not been used by Flash for a long time now.

Change-Id: I53116e30145d7f322d2e27960b7b507691e75694
Reviewed-on: https://chromium-review.googlesource.com/1162585Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584765}