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Revert of [Contextual Search] Remove opt-in code. (patchset #6 id:100001 of https://codereview.chromium.org/1103163004/)

Reason for revert:
It broke Clank bots.

Original issue's description:
> [Contextual Search] Remove opt-in code.
>
> This CL requires a downstream change:
> https://chrome-internal-review.googlesource.com/#/c/214963/
>
> BUG=482618
> R=donnd@chromium.org, dtrainor@chromium.org, thakis@chromium.org
>
> Committed: https://chromium.googlesource.com/chromium/src/+/277f043bb56fb1e4bb93d9d17fc3de4ada0eb81b

TBR=donnd@chromium.org,mathp@chromium.org,dtrainor@chromium.org,thakis@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=482618

Review URL: https://codereview.chromium.org/1123313006

Cr-Commit-Position: refs/heads/master@{#330248}