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This change reimplements the import/export functionality to the PM
settings as it existed in the previous version, before the Material
redesign.

Bug: 674536
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I686dc1152e95bc74ad21c3137b5aebf226801aed
Reviewed-on: https://chromium-review.googlesource.com/663380
Commit-Queue: Nathanael Alcock <varkor@google.com>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504372}