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This reverts commit e2eec62f.

Reason for revert: Depends on crrev.com/c/2586246 which needs to be reverted, see crbug.com/1158739

Original change's description:
> Remove pre-initialization OptimizationGuideKeyedService logic
>
> In practice, this doesn't happen at all and cannot happen at all after
> the incognito CL goes in
>
> Change-Id: I0daf1c4cbb189840913ee4a368dda437e07efaca
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587396
> Commit-Queue: Sophie Chang <sophiechang@chromium.org>
> Reviewed-by: Michael Crouse <mcrouse@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#836699}

TBR=sophiechang@chromium.org,mcrouse@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

Change-Id: I2710ea9316e355c8e435d185f49828a11974a0c3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593108Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837033}