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In some circumstances, the shutdown logic can run when there are no
connected scenes (possibly when force-quitting). Asking for the
browser interface in this situation will cause an array overflow. This
CL is a quick patch to bypass that pending a cleaner fixup.

Bug: 1113097
Change-Id: I3e14c9bbd887c7ef66ee7e6454f4484bad8cb03a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367080
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801083}