Revert of [es6] Fix Function and GeneratorFunction built-ins subclassing. (patchset #4 id:80001 of https://codereview.chromium.org/1428823002/ )

Reason for revert:
Buildbot failures

Original issue's description:
> [es6] Fix Function and GeneratorFunction built-ins subclassing.
>
> BUG=v8:3101, v8:3330
> LOG=Y
>
> Committed: https://crrev.com/99e7f872d3d0a5fb799dcbafb05537cda491314a
> Cr-Commit-Position: refs/heads/master@{#31708}

TBR=verwaest@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:3101, v8:3330

Review URL: https://codereview.chromium.org/1413723008

Cr-Commit-Position: refs/heads/master@{#31709}