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Onion-souping landed long ago, so remove the TODO item in the doc.

Change-Id: I58a20028eeae43fd56ac37f86d3be20e5b01b315
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547944
Auto-Submit: Eric Lawrence [MSFT] <ericlaw@microsoft.com>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828963}