Revert of Print stack traces in child processes when browser tests failed.

Revert of Print stack traces in child processes when browser tests failed. (patchset #5 id:80001 of https://codereview.chromium.org/1291553003/ )

Reason for revert:
This is unfortunately breaking Windows 10 in a major way. I did a local bisect and narrowed it down to this CL.

BUG=521242
Original issue's description:
> Print stack traces in child processes when browser tests failed.
>
> The functionality to do this opens up security holes. Currently this was working only for debug Linux builds. However our trybots are release builds, and we need to be able to see stack traces from child processes on all platforms (i.e. to be able to debug the large flakiness that occurred since last week). This is disabled for official builds.
>
> BUG=517488, 358267
>
> Committed: https://crrev.com/8ba532e170befc312e66d032587fa2ad04bac975
> Cr-Commit-Position: refs/heads/master@{#343240}

TBR=scottmg@chromium.org,jln@chromium.org,wfh@chromium.org,jam@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=517488, 358267
Committed: https://crrev.com/531d19bbe954ecd92d2027d2c4d0d6c850cfe0de
Cr-Commit-Position: refs/heads/master@{#343603}

[Ken Rockot(use gerrit already), 2015-08-16 17:36:23]

Created Revert of Print stack traces in child processes when browser tests
failed.

[commit-bot: I haz the power, 2015-08-16 17:36:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1299583002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1299583002/1

[commit-bot: I haz the power, 2015-08-16 17:36:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-16 17:37:34]

Patchset 1 (id:??) landed as
https://crrev.com/531d19bbe954ecd92d2027d2c4d0d6c850cfe0de
Cr-Commit-Position: refs/heads/master@{#343603}