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...plus all the code for handling them.
These were unused (outside of some tests), so this was all dead code.

Bug: 1145589
Change-Id: Ic54a7fa293dc8cf5e785acb6cb137118f91f51d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518981Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824403}