I could not find any usage of this struct and it is in the internal
namespace so I though it might be safe to remove it.

Bug: 
Change-Id: I85d605712ab1ab3218eb03ed4d3b5fc0e541e21a
Reviewed-on: https://chromium-review.googlesource.com/641270Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47813}