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These were all expired after M77, adding <obsolete> tag and cleaning up
code.

Bug: 691863
Change-Id: Ibf654b78aad2b6bbbf85b2527f55dfe1d51c9f35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2029289Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736961}