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This CL prevents the selection of promo cell (the following screenshot)
https://drive.google.com/file/d/0B1dtd3IUt4I7RUh5MjdLRWtaYmM
by setting promo cell’s selection style to none.

Bug: 695749
Change-Id: I5df7ec5033a379f68970fa8cf11789b2a11078a9
Reviewed-on: https://chromium-review.googlesource.com/684634Reviewed-by: Eric Noyau <noyau@chromium.org>
Commit-Queue: Eric Noyau <noyau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504368}