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In a multiprofile session, windows can be sent to other desktops. This
can be done to the Files app, and when files are opened when it is in
this state the apps may open on the original desktop (i.e. that of the
profile that owns the files). When this occurs an info message is
displayed as otherwise it appears to the user as though nothing
happened.

The files app shows this message for web apps even though they are
opened on the current desktop. This change stops the info message being
shown in this case.

This change also adds some clarifying comments and also adds some TODOs
for other situations that might have similar bugs.

Bug: 1109589
Change-Id: I9ceab68fc6547813d4e83f879e04adbcf07a1093
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359870Reviewed-by: Alex Danilo <adanilo@chromium.org>
Commit-Queue: Ben Wells <benwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806545}