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Some system apps such as settings will only ever show in
a single window.  Others such as terminal allow multiple
windows of the app.

Bug: 1028861
Change-Id: Ifc4348a13f9f92c39e39e3c52e072bc0cfe97d93
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1942598Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720867}