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This keeps users from accidentally disabling automatic clicks and
therefore locking themselves out of their device by making it so
that they need a physical click to re-enable the feature.

Dialog is shown when disabling from the accessibility menu in the
tray and from the settings WebUI page.

Bug: 960526
Change-Id: I681c8bfc1b668e6b290b33d889355b2a6f43500a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1601468Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Anastasia Helfinstein <anastasi@google.com>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659084}