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This CL removes one difference between promotable web apps and
"Create Shortcut" web apps where Blink's understanding of the app's
scope was disabled for shortcut apps.

This makes promotable web apps and shortcut apps behave the same for
autoplay policy, keyboard events in app windows and picture in picture
mode (see uses of Document::IsInWebAppScope()). This is desirable
because promotable/non-promotable web apps are effectively identical to
the user so the fewer hidden behavioural differences the better.

Bug: 910016
Change-Id: I4d1e29566520369436b58ecdd1ba2eaefa17de31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2041379
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740528}