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This change also removes the backing switches; after this change it is no longer
possible to disable physical-keyboard-autocorrect.

Bug: 961526
Change-Id: Id15dfe05a048e99c399ce5cf34c3bdd0b2b716e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611903
Auto-Submit: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Shu Chen <shuchen@chromium.org>
Reviewed-by: Shu Chen <shuchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659771}