Revert of Set lower allocation limit in idle notification only if no GC happend recently.

Revert of Set lower allocation limit in idle notification only if no GC happend recently. (patchset #2 id:20001 of https://codereview.chromium.org/1143113002/)

Reason for revert:
[Sheriff] MSAN not happy:
http://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20MSAN/builds/2352

Original issue's description:
> Set lower allocation limit in idle notification only if no GC happend recently.
>
> BUG=475674
> LOG=n
>
> Committed: https://crrev.com/35e3489e8f70c7ad5973324ad3cfa4ab27059ab4
> Cr-Commit-Position: refs/heads/master@{#28506}

TBR=ulan@chromium.org,hpayer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=475674
Committed: https://crrev.com/64b1b1d13047ac8dc37b108cb9e276da0d8a0a8e
Cr-Commit-Position: refs/heads/master@{#28511}

[Michael Achenbach, 2015-05-20 12:48:40]

Created Revert of Set lower allocation limit in idle notification only if no GC
happend recently.

[commit-bot: I haz the power, 2015-05-20 12:48:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1145113003/1

[commit-bot: I haz the power, 2015-05-20 12:49:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-20 12:49:32]

Patchset 1 (id:??) landed as
https://crrev.com/64b1b1d13047ac8dc37b108cb9e276da0d8a0a8e
Cr-Commit-Position: refs/heads/master@{#28511}