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Move contextualsearch/ constants into it.

Not moving all of the constants in ChromePreferenceManager at once
so that the review is more focused.

Bug: 1022107

Change-Id: I1da396bb180e5a7c05be42390d06e507a3771ff1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900575
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Donn Denman <donnd@chromium.org>
Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713585}