GitLab

When a user has a web app installed then uninstalled via policy we leave
behind some policy install info in their prefs. This info is used by
CanCreateWebApp() to determine whether there is an app already installed
by policy.
This causes a bug where users cannot install web apps after they've been
removed from policy.

This CL updates the check to also check whether the app is actually
installed and not just check for the presence of the pref data.

Bug: 1090182
Change-Id: I736118cec4e0b1ff34ae335965dc7b8816c20837
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2224417
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774395}