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Currently, when ctrl+search+m is used to toggle the magnifier,
this is not reflected in chrome://settings.

However, the other accelerators (docked magnifier and high contrast)
are reflected in settings.

Bug: 853104
Test: Manual
Change-Id: Ia70b868eb89598ba90b79e2e5da482bd0bb6a916
Reviewed-on: https://chromium-review.googlesource.com/1114524
Commit-Queue: Sara Kato <sarakato@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572416}