Revert of Suppress an uninitialized read in ThreadHeap<>::sweepNormalPages

Revert of Suppress an uninitialized read in ThreadHeap<>::sweepNormalPages (patchset #2 of https://codereview.chromium.org/502233002/)

Reason for revert:
The fix (https://src.chromium.org/viewvc/blink?revision=180854) should be included by the Blink roll in http://crrev.com/ecb9875276ccd.

Original issue's description:
> Suppress an uninitialized read in ThreadHeap<>::sweepNormalPages
> 
> BUG=407396
> NOTRY=true
> TBR=ager@chromium.org
> NOTREECHECKS=true
> 
> Committed to pending queue: https://chromium.googlesource.com/chromium/src/+/8da39ba

TBR=ager@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=407396
Committed: https://crrev.com/7233c9d809f5ef5a2cd22badc57a667ab305d055
Cr-Commit-Position: refs/heads/master@{#291983}

[Jeffrey Yasskin, 2014-08-26 21:12:01]

Created Revert of Suppress an uninitialized read in
ThreadHeap<>::sweepNormalPages

[commit-bot: I haz the power, 2014-08-26 21:13:51]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jyasskin@chromium.org/507833002/1

[commit-bot: I haz the power, 2014-08-26 21:15:59]

Committed patchset #1 (1) as d02e7eac5bdc39abfe9b6601b53212ac6c5700b8

[Mads Ager (chromium), 2014-08-27 06:20:27]

On 2014/08/26 at 21:15:59, commit-bot wrote:
> Committed patchset #1 (1) as d02e7eac5bdc39abfe9b6601b53212ac6c5700b8

LGTM, thanks!

[commit-bot: I haz the power, 2014-09-10 02:45:40]

Patchset 1 (id:??) landed as
https://crrev.com/7233c9d809f5ef5a2cd22badc57a667ab305d055
Cr-Commit-Position: refs/heads/master@{#291983}