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Screenshots should only be visible if we have screenshot items.
Downloads should only be visible if we have download items.
Recent files should only be visible if we screenshots and/or downloads.

Bug: 1131253
Change-Id: I1bf70b6312c46cf5f7dbc616c5e33e7af0ad2740
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434468
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Ahmed Mehfooz <amehfooz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812493}