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This deletes a bunch of old code that is no longer needed.

Bug: 1121673
Change-Id: Ie5fccd67aaa989d9011018a14315c5f18c8a452c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2376365Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803958}