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Almost all implementations of this method are empty so there isn't
really a good reason why it should be required.

Bug: 
Change-Id: I1e680280db194a8af6d00f689e70ad64c9a9062f
Reviewed-on: https://chromium-review.googlesource.com/792755Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Commit-Queue: Blake O'Hare <blakeo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519588}