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The preferences are used to define persistent storage of maps of strings to boolean values
which can be used for implementing crbug.com/1060965 and other assistive features.

Change-Id: Ibe93ac0f4ec85333840d3e9a8547ebee4a445d9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2126429
Commit-Queue: Keith Lee <keithlee@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769630}