Revert of Simplify WeakMap and WeakSet tests slightly.

Revert of Simplify WeakMap and WeakSet tests slightly. (patchset #1 id:1 of https://codereview.chromium.org/903463002/)

Reason for revert:
Revert this patch as the original CL has to be reverted to due to shared win build failure

http://build.chromium.org/p/client.v8/builders/V8%20Win32%20-%20nosnap%20-%20shared/builds/5030/steps/compile/logs/stdio

Original issue's description:
> Simplify WeakMap and WeakSet tests slightly.
>
> R=rossberg@chromium.org
> TEST=cctest/test-weakmaps,cctest/test-weaksets
>
> Committed: https://crrev.com/a90d7a871da19d33e93c8779186408c8d1615cac
> Cr-Commit-Position: refs/heads/master@{#26428}

TBR=rossberg@chromium.org,mstarzinger@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/e225675ea605b7535292ea45c02f95ae7ae04480
Cr-Commit-Position: refs/heads/master@{#26429}

[yurys, 2015-02-04 15:10:36]

Created Revert of Simplify WeakMap and WeakSet tests slightly.

[commit-bot: I haz the power, 2015-02-04 15:11:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/899833003/1

[commit-bot: I haz the power, 2015-02-04 15:11:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-04 15:11:51]

Patchset 1 (id:??) landed as
https://crrev.com/e225675ea605b7535292ea45c02f95ae7ae04480
Cr-Commit-Position: refs/heads/master@{#26429}

[Michael Starzinger, 2015-02-04 15:11:53]

LGTM (rubber-stamped). Please integrate this CL in the re-land.