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We still need some NewTabPage.ContentSuggestions histograms since Zine and Jardin are still in Stable.

Bug: NONE
Change-Id: I731f8734513df84fbc25bffffaaac3c2d5b1069f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2393240
Commit-Queue: Dmitry Titov <dimich@chromium.org>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804525}