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This CL fixes an issue with the experimental app list search where the
app results would sometimes not show up. This was being caused by the
display type not being updated when the result was copied from the
mixer, causing recommendation results not to change into tile results.

BUG=456060

Review URL: https://codereview.chromium.org/909773002

Cr-Commit-Position: refs/heads/master@{#315264}