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Currently Zip Archiver run in the normal and incognito contexts in
parallel when opening a single ZIP file in the Files app.
The instance in the incognito context also received and processed events
in onGetMetadataRequested, but it always fails because it doesn't run
the normal initialization procedure.
(i.e. loading volume and filling unpacker.app.volumeLoadedPromises)

It once had worked harmlessly because error was ignored, but now
the error in the incognito context triggers unmounting of the file.
It can cancel out the volume mounted by the other instance in the
normal context right before it.

Bug: 833603
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I712a974ca4fe287d795256fc22a62d5c85d66401
Reviewed-on: https://chromium-review.googlesource.com/1018624
Commit-Queue: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Reviewed-by: Yuki Awano <yawano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553950}