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Existing code always wrote zip file to temporary filesystem and then
moved to the destination, as a workaround for crbug.com/785086.
It is not needed for local volumes like Downloads.
Requesting temporary file system in the guest mode caused runtime error.
We can avoid that error by this because there is no Drive volume in the
guest mode.

Bug: 834675
Test: manually verified by zipping files in Drive, Downloads and in guest mode
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: If920f49564309a43ddcf5ca02ee8aa6baa3e6482
Reviewed-on: https://chromium-review.googlesource.com/1027394
Commit-Queue: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Reviewed-by: Yuki Awano <yawano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553985}