Revert of [es6] Better support for built-ins subclassing.

Revert of [es6] Better support for built-ins subclassing. (patchset #8 id:200001 of https://codereview.chromium.org/1427483002/ )

Reason for revert:
Breaks test on win32 nosnap.http://build.chromium.org/p/client.v8/builders/V8%20Win32%20-%20nosnap%20-%20shared/builds/9680

Original issue's description:
> [es6] Better support for built-ins subclassing.
>
> Create proper initial map for original constructor (new.target) instead of doing prototype transition on the base constructor's initial map. This approach fixes in-object slack tracking for subclass instances.
> This CL also fixes subclassing from String.
>
> BUG=v8:3101, v8:3330
> LOG=Y
>
> Committed: https://crrev.com/cd5f48302a502154a0106d12e3066bd563c6340c
> Cr-Commit-Position: refs/heads/master@{#31680}

TBR=verwaest@chromium.org,ulan@chromium.org,ishell@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:3101, v8:3330
Committed: https://crrev.com/08ca3f240c6c279e956af8fd1b525abd4edf8ff7
Cr-Commit-Position: refs/heads/master@{#31684}

[Benedikt Meurer, 2015-10-30 11:36:00]

Created Revert of [es6] Better support for built-ins subclassing.

[commit-bot: I haz the power, 2015-10-30 11:36:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1416943005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1416943005/1

[commit-bot: I haz the power, 2015-10-30 11:36:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-30 11:36:41]

Patchset 1 (id:??) landed as
https://crrev.com/08ca3f240c6c279e956af8fd1b525abd4edf8ff7
Cr-Commit-Position: refs/heads/master@{#31684}