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This change fixes a https://crbug.com/851937 where users are unable to
clear auto-opening downloads settings.

Bug: chromium:851937
Test: verified manually
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I263ef9497a8a9b298a3514404fc3f31a61393687
Reviewed-on: https://chromium-review.googlesource.com/1099693Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567299}