Revert of Fix FreeList::zapFreedMemory to fail "use-of-uninitialized-value" on MSAN

Revert of Fix FreeList::zapFreedMemory to fail "use-of-uninitialized-value" on MSAN (patchset #9 id:160001 of https://codereview.chromium.org/1259893002/)

Reason for revert:
Strange, it passed MSAN try bot, but not the MSAN bots on waterfall...reverting.

Original issue's description:
> Fix FreeList::zapFreedMemory to fail "use-of-uninitialized-value" on MSAN
> 
> A CL for fallback font collection[1] broke MSAN bots[2] and was reverted.
> 
> Another try to fix[2] also fails on MSAN bots at
> FreeList::zapFreeMemory[3]. This patch allows zapFreeMemory to write to
> uninitialized memory.
> 
> [1] https://codereview.chromium.org/1241613006/
> [2] https://codereview.chromium.org/1244973003/
> [3] http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_msan_rel_ng/builds/84
> 
> BUG=514099
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=199701

TBR=haraken@chromium.org,glider@chromium.org,yutak@chromium.org,sigbjornf@opera.com,tkent@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=514099
Committed: https://crrev.com/cbb3e54d099ac3c2e63dd784288b522e44b69ffc
git-svn-id: svn://svn.chromium.org/blink/trunk@199704 bbb929c8-8fbe-4397-9dbb-9b2b20218538

[kojii, 2015-07-30 04:27:58]

Created Revert of Fix FreeList::zapFreedMemory to fail
"use-of-uninitialized-value" on MSAN

[commit-bot: I haz the power, 2015-07-30 04:28:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1257303003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1257303003/1

[commit-bot: I haz the power, 2015-07-30 04:28:34]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=199704

[tkent, 2015-07-30 04:30:58]

lgtm

[haraken, 2015-07-30 05:32:06]

LGTM

[commit-bot: I haz the power, 2015-09-23 11:55:07]

Patchset 1 (id:??) landed as
https://crrev.com/cbb3e54d099ac3c2e63dd784288b522e44b69ffc