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For some downloaded items like Chrome apps, Chromium hides the download
bar once the download completes if there are no other download items in
it. However, if you cause the download item to display its context menu,
the context menu will remain visible even after the bar disappears.

BUG=480884

Review URL: https://codereview.chromium.org/1125423002

Cr-Commit-Position: refs/heads/master@{#330221}