Revert of Use a class instead of several separate globals in crash_logging.cc.

Revert of Use a class instead of several separate globals in crash_logging.cc. (patchset #3 id:60001 of https://codereview.chromium.org/1368703002/ )

Reason for revert:
This CL is the culprit of an uninit read and several test crash on Valgrind bots.

BUG=535990
Original issue's description:
> Use a class instead of several separate globals in crash_logging.cc.
>
> There should be no behavior change; this is just refactoring.
>
> Committed: https://crrev.com/5e57bcecf023ec05c9c2343b2b636f3d7e0cf1f1
> Cr-Commit-Position: refs/heads/master@{#350701}

TBR=danakj@chromium.org,rsesek@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/957cf8cf24209ccb63c59ee7cdddbb07aeaab386
Cr-Commit-Position: refs/heads/master@{#350829}

[zhaoqin1, 2015-09-25 15:14:28]

Created Revert of Use a class instead of several separate globals in
crash_logging.cc.

[commit-bot: I haz the power, 2015-09-25 15:14:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1360943004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1360943004/1

[commit-bot: I haz the power, 2015-09-25 15:16:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-25 15:17:00]

Patchset 1 (id:??) landed as
https://crrev.com/957cf8cf24209ccb63c59ee7cdddbb07aeaab386
Cr-Commit-Position: refs/heads/master@{#350829}