Revert "Make logic for disabling OS crash catcher on OSX match comment."

Mac: Revert "Make logic for disabling OS crash catcher on OSX match comment."

This CL breaks chrome://inducebrowsercrashforrealz

I don't know exactly why the behavior is broken, but it appears that setting a
signal handler for SIGTRAP interferes with breakpad exception handling. See bug
for more details.

Original CL: https://codereview.chromium.org/329423003
Original Commit: d81d222cb0d4d83436e1723f697951deaf68fdfa

TBR=cpu@chromium.org
BUG=402337
Committed: https://crrev.com/bf330448d462fd6fd9199ad2a7b33080974c88ba
Cr-Commit-Position: refs/heads/master@{#296530}

[erikchen, 2014-09-24 17:38:22]

erikchen@chromium.org changed reviewers:
+ rsesek@chromium.org

[erikchen, 2014-09-24 17:38:23]

rsesek: Please review.

The CL in question is also likely responsible for
https://code.google.com/p/chromium/issues/detail?id=407549, although I don't
have a repro, so I cannot confirm.

[Robert Sesek, 2014-09-24 17:39:09]

LGTM

[erikchen, 2014-09-24 17:40:01]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2014-09-24 17:40:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/602793002/1

[commit-bot: I haz the power, 2014-09-24 17:51:09]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-24 17:51:10]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[Nick Bray (chromium), 2014-09-24 21:09:40]

ncbray@chromium.org changed reviewers:
+ ncbray@chromium.org

[Nick Bray (chromium), 2014-09-24 21:09:40]

LGTM as the original commiter, will try to round up OWNERS.

[Robert Sesek, 2014-09-24 21:10:13]

Reverts can be TBR'd.

[Nick Bray (chromium), 2014-09-24 21:13:30]

ncbray@chromium.org changed reviewers:
+ cpu@chromium.org

[Nick Bray (chromium), 2014-09-24 21:13:30]

Pushing it through, TBR cpu.

[Nick Bray (chromium), 2014-09-24 21:13:35]

The CQ bit was checked by ncbray@chromium.org

[commit-bot: I haz the power, 2014-09-24 21:14:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/602793002/1

[commit-bot: I haz the power, 2014-09-24 21:47:27]

Committed patchset #1 (id:1) as fe0ca84044d2c743a86c5614c960d42e09cf7b24

[commit-bot: I haz the power, 2014-09-24 21:48:27]

Patchset 1 (id:??) landed as
https://crrev.com/bf330448d462fd6fd9199ad2a7b33080974c88ba
Cr-Commit-Position: refs/heads/master@{#296530}