Revert of Plumb Push Event's WebServiceWorkerEventResult to browser status enum ...

Revert of Plumb Push Event's WebServiceWorkerEventResult to browser status enum (patchset #3 id:40001 of https://codereview.chromium.org/717083004/)

Reason for revert:
Compiler errors on android:

http://build.chromium.org/p/chromium/buildstatus?builder=Android&number=31434

Original issue's description:
> Plumb Push Event's WebServiceWorkerEventResult to browser status enum
>
> This will later allow us to log to UMA how often Service Worker JS
> passes a rejected Promise to event.waitUntil inside the Push event.
>
> BUG=401438
>
> Committed: https://crrev.com/6d4f18c990de761829814696e54bc33055ee922c
> Cr-Commit-Position: refs/heads/master@{#305855}

TBR=peter@chromium.org,palmer@chromium.org,michaeln@chromium.org,avi@chromium.org,mvanouwerkerk@chromium.org,johnme@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=401438

Review URL: https://codereview.chromium.org/757403002

Cr-Commit-Position: refs/heads/master@{#305864}