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Sometimes a request can be made after a tab has been destroyed (invalid
tab ID) which can happen for beacon requests. In this case, if a rule
was matched for the request, the feedback API should attribute it to the
unknown tab ID.

This behavior is similar to when a tab is destroyed, its matched rules
get re-mapped to the unknown tab ID.

Bug: 1153953
Change-Id: Ief359df2dd83fb5eeaab7ab881a62a9ff4d888eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567632
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833396}