Revert of Service Worker: Add tests for same-scope new script registration (patchset #6 of https://codereview.chromium.org/480943002/)

Reason for revert:
This is crashing on Mac.

Original issue's description:
> Service Worker: Add tests for same-scope, new script registration
> 
> Tests for Chromium patch:
> https://codereview.chromium.org/506043002/
> 
> BUG=398355
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180948

TBR=michaeln@chromium.org,nhiroki@chromium.org,falken@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=398355

Review URL: https://codereview.chromium.org/512703002

git-svn-id: svn://svn.chromium.org/blink/trunk@180956 bbb929c8-8fbe-4397-9dbb-9b2b20218538