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This patch means cleaning up old pref that have passed over year+.
A follow up to that CL.
(https://chromium-review.googlesource.com/c/chromium/src/+/1264343)

Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Ib1949419b5b2df9b6906d5f5b7d100f5d5a7046c
Reviewed-on: https://chromium-review.googlesource.com/c/1278455Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Jaeyong Bae <jdragon.bae@gmail.com>
Cr-Commit-Position: refs/heads/master@{#600003}