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This has been announced as "will be removed in M70" for many versions.
This CL actually removes them.

Usage is negligible.

Bug: 854385
Change-Id: I6af1279978de669e433fa5eb6e0b62dfd348b8bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1713539Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Commit-Queue: Harald Alvestrand <hta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680411}