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This CL updates our preinstalled web app replacement flow to disable
the web app if the Chrome app it's meant to replace has been disabled
by admin policy.

This is to prevent default apps appearing on enterprise devices during
web app migration when they were originally being blocked as Chrome apps.

Bug: 1131338
Change-Id: I44a5d0c3c9b547c28a5c3b664e53844335ab3da3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425549
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813060}