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The chrome://apps page can often be loaded / reloaded during WebApp
uninstall. Since the event it listens to occurs before uninstall, it
can miss this and still display stale apps. This change also has the
site listen to OnWebAppUninstalled() to ensure this does not happen.

R=cmp@chromium.org

Bug: 1164590
Change-Id: I6f02363c3b3afd5ae396e680617de78f099eef13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625333
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Auto-Submit: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Chase Phillips <cmp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843237}