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This reverts commit b60e5cc0.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 589389 as the
culprit for failures in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtL2I2MGU1Y2MwYmQ0YjM1MWM1ODk4ZGMzNjM3ZjUzN2MzNTU1NDZjMTEM

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.linux/Cast%20Audio%20Linux/20069

Sample Failed Step: base_unittests

Original change's description:
> [PartitionAlloc] Add a flag to allow callers to zero-fill allocations.
> 
> This enables callers to avoid doing it themselves (centralizing the `memset` in
> 1 place, rather than duplicating it at every call site that wants it), and to
> allow the PartitionAlloc implementation to avoid doing it itself if the
> operating system has already zero'd the new page(s).
> 
> Bug: 864462,680657
> Change-Id: Ibeae0bf7b9f20238334bf9bc022d0f243a77ef11
> Reviewed-on: https://chromium-review.googlesource.com/1162825
> Commit-Queue: Chris Palmer <palmer@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Albert J. Wong <ajwong@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#589389}

Change-Id: Ifd54700a2acb141c458df69304d7ccdce2719cc5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 864462,680657
Reviewed-on: https://chromium-review.googlesource.com/1212346
Cr-Commit-Position: refs/heads/master@{#589404}