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Before this patch, Web Payment would enable app store integration on
Chrome OS when invoked from an origin that has a TWA, even if not
currently running in a TWA. This allowed tabs to invoke the app store
billing flow.

This patch returns an empty TWA package name to Web Payment when
Browser::app_controller() is null.

After this patch, Web Payment enables the app the store billing flow
only when running inside of a TWA.

Bug: 1156537
Change-Id: Ie0ba5b0980be193dfcab36177d652e4ed2635407
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580011Reviewed-by: Jeevan Shikaram <jshikaram@chromium.org>
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834984}