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This is a reland of 18a0e5d1 which was
reverted at https://chromium-review.googlesource.com/643427 due to a
use-of-uninitialized-value, which is fixed in PS2 here.

Original change's description:
> Instant cleanup: Remove SearchMode
> 
> It was now just a wrapper around the Origin enum, so let's just use that
> directly.
> 
> Followup to https://chromium-review.googlesource.com/638335
> 
> Bug: 627747
> Change-Id: I761e17f93817b04fd7841f17e754926bfcd7fcec
> Reviewed-on: https://chromium-review.googlesource.com/640389
> Commit-Queue: Marc Treib <treib@chromium.org>
> Reviewed-by: Chris Pickel <sfiera@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#498410}

Bug: 627747
Change-Id: Iad49a8e49063284ea5baa36a4041a31869b890e5
Reviewed-on: https://chromium-review.googlesource.com/643511Reviewed-by: Chris Pickel <sfiera@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#498856}