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As we look towards adding a enterprise policy, we want to have an
option to show/hide the menu item, and an option to enabled/disabled
the menu item.

This CL updates the existing parameter to indicate what the flag
actually does.

Explainer: https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/master/RunOnLogin/Explainer.md
I2P: https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/T6d2zqF_jpw/76TP7Bc2DwAJ

Bug: 897302
Change-Id: I4ef7becd32dd003d8efaab503f0d51a7919d589a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2637329Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Chase Phillips <cmp@chromium.org>
Commit-Queue: Mike Jackson <mjackson@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#845290}