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When opening a web app from ARC++, if the web app is associated to a
web-only TWA, we want to close the ARC++ associated with the web app.

Bug: 1026230
Change-Id: If223f638ba361956a486c52007b953301a78c9e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2220114Reviewed-by: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Jeevan Shikaram <jshikaram@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773908}