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This CL updates the preinstalled web app to exclude configs that want to
uninstall_and_replace preinstalled Chrome apps that have been
uninstalled by the user.

Bug: 1123435
Change-Id: I5522523680d4a5a20fa3f1f615bd6b2824692e9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425604
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811176}