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While working on Run On OS Login for Mac, I noticed that the shared
app shims were being deleted when toggling Run On OS Login. This happens
because the app shims unconditionally delete the app shims.

This change moves the code to delete the shared app shims behind
the shortcut check. On Mac you can have both per profile shims,
and shared shims, so the callbacks are chained together only on
that platform.

Bug: 897302
Change-Id: I318137ac0f34e4f2429a5119d47e3fe5c3c96892
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519877
Commit-Queue: Mike Jackson <mjackson@microsoft.com>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Phillis Tang <phillis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825165}