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After PM/UX discussion, we don't want to duplicate the search engine
drop-down between browser and OS settings. Instead, OS settings uses
an info label with a link to browser settings.

Screenshots on bug:
https://bugs.chromium.org/p/chromium/issues/detail?id=960937#c7

Bug: 960937
Change-Id: I622558c4c7238dc8f3d36d3a63305e7abc0f473a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1640601Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665641}