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The prompt status pref for download later dialog is similar to the
prompt status used in the download location dialog. The checkbox and
the setting UX spec is the same as well.

Bug: 1078454
Change-Id: Ibaea0c63782b8fb4e33fc1336c862a015c9d219a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2236213Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776200}