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This reverts commit b53e31ad.

Reason for revert: Crashes on Canary https://crbug.com/1148731

Original change's description:
> Merge old and new list policies that were renamed
>
> This change moves migrating of renamed policies from the PolicyHandler
> to a PolicyMigrator that happens right after the PolicyMerger has run.
> This guarantees that list policies can be properly merged between
> sources even if different sources provide different naming.
>
> BUG=1138572
> TEST=browser_tests:PolicyPrefsTest.PolicyToPrefsMapping
>
> Change-Id: Ibe335176ef52dabbe09c076ba57ae04d1c67c1c6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2507771
> Commit-Queue: Julian Pastarmov <pastarmovj@chromium.org>
> Reviewed-by: Owen Min <zmin@chromium.org>
> Reviewed-by: Yann Dago <ydago@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#826903}

TBR=pastarmovj@chromium.org,zmin@chromium.org,ydago@chromium.org

Change-Id: I550446cbe736502003862ea9965b2277306b0890
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1138572
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536875Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827231}