[Mac] In base::mac::CxxPersonalityRoutine, delegate back to __gxx_personality_v0.

[Mac] In base::mac::CxxPersonalityRoutine, delegate back to __gxx_personality_v0.

This fixes a hypothetical issue where returning _URC_END_OF_STACK in phase two
of exception processing could confuse libunwind. If this personality routine
is called in phase two, it will now delegate back to the normal C++ personality
routine. See https://crbug.com/576941#c62 for details.

BUG=576941
R=mark@chromium.org

Committed: https://crrev.com/dd20bfda89d5d2a62175a690fc71009e36adb39d
Cr-Commit-Position: refs/heads/master@{#403235}

[Robert Sesek, 2016-06-30 17:32:57]

Patchset #2 (id:20001) has been deleted

[Mark Mentovai, 2016-06-30 18:25:24]

LGTM

[Robert Sesek, 2016-06-30 18:39:22]

The CQ bit was checked by rsesek@chromium.org

[commit-bot: I haz the power, 2016-06-30 18:40:18]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-06-30 19:04:29]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2016-06-30 19:05:59]

Description was changed from

==========
[Mac] In base::mac::CxxPersonalityRoutine, delegate back to
__gxx_personality_v0.

This fixes a hypothetical issue where returning _URC_END_OF_STACK in phase two
of exception processing could confuse libunwind. If this personality routine
is called in phase two, it will now delegate back to the normal C++ personality
routine. See https://crbug.com/576941#c62 for details.

BUG=576941
R=mark@chromium.org
==========

to

==========
[Mac] In base::mac::CxxPersonalityRoutine, delegate back to
__gxx_personality_v0.

This fixes a hypothetical issue where returning _URC_END_OF_STACK in phase two
of exception processing could confuse libunwind. If this personality routine
is called in phase two, it will now delegate back to the normal C++ personality
routine. See https://crbug.com/576941#c62 for details.

BUG=576941
R=mark@chromium.org

Committed: https://crrev.com/dd20bfda89d5d2a62175a690fc71009e36adb39d
Cr-Commit-Position: refs/heads/master@{#403235}
==========

[commit-bot: I haz the power, 2016-06-30 19:06:00]

Patchset 2 (id:??) landed as
https://crrev.com/dd20bfda89d5d2a62175a690fc71009e36adb39d
Cr-Commit-Position: refs/heads/master@{#403235}