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This CL makes sure that the correct trait collection is used when
checking if the NTP is displaying one or two toolbars.
With multiwindow, it is not possible to directly check the key window.

Fixed: 1128527
Change-Id: I79a441b1a186c755b7cc979f527e807f10aa3a29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422955
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809718}