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This change replaces the previous, partial implementation of the
detection of available prefetched articles when choosing how to present
the Downloads Home when it is being launched from the dino page. The
logic was moved from the mojom service implementation to the renderer
side helper for available content and now supports both the summary and
list presentation modes.

Bug: 852872
Change-Id: I82652e7a19f5a864e8cd56882eb06fb44593a994
Reviewed-on: https://chromium-review.googlesource.com/c/1235373
Commit-Queue: Carlos Knippschild <carlosk@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Cathy Li <chili@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Dan H <harringtond@google.com>
Cr-Commit-Position: refs/heads/master@{#597619}