Revert of [Extensions] Migrate ServiceWorker off behavior feature system (patchset #1 id:1 of https://codereview.chromium.org/1417563005/ )

Reason for revert:
Reverting because this CL appears to be causing failures on this bot: https://build.chromium.org/p/chromium.win/builders/Win%20x64%20Builder%20%28dbg%29/builds/14499 .

Original issue's description:
> [Extensions] Migrate ServiceWorker off behavior feature system
>
> The FeatureSystem is failing to retrieve the behavior feature for service
> workers, but the only reason this seems to be the case is because of
> potential corruption in the JSON files (or the JSON parser otherwise choking).
> For now, to reduce the crash rates, just migrate the service worker restriction
> off the behavior feature system.
>
> BUG=461915
>
> Committed: https://crrev.com/2507a2fcd25244dadb7dfcc316426bee7b1df275
> Cr-Commit-Position: refs/heads/master@{#356123}

TBR=rockot@chromium.org,rdevlin.cronin@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=461915

Review URL: https://codereview.chromium.org/1412683007

Cr-Commit-Position: refs/heads/master@{#356137}
3 files changed