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There are a few lower priority differences with the CrOS file
picker so the flexibility to switch is currently still useful.

BUG=None
TEST=trybot

Change-Id: Ib05ee202726ebe460a2684fbbdbe26b79bdb3ab8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2014200Reviewed-by: Naoki Fukino <fukino@chromium.org>
Commit-Queue: Satoshi Niwa <niwa@chromium.org>
Auto-Submit: Satoshi Niwa <niwa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733879}