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Revert of Ensure the new navigation classifier works in the real world. (patchset #1 id:1 of https://codereview.chromium.org/1136663004/)

Reason for revert:
Occasional crashes.

Original issue's description:
> Ensure the new navigation classifier works in the real world.
>
> BUG=369661
> TEST=No whammies!
>
> Committed: https://crrev.com/f97970c11c08a18e9ecea0b1b4c77122371a0e4f
> Cr-Commit-Position: refs/heads/master@{#329497}

TBR=creis@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=369661

Review URL: https://codereview.chromium.org/1140123002

Cr-Commit-Position: refs/heads/master@{#329849}