Unreviewed, rolling out r142825.

Unreviewed, rolling out r142825.
http://trac.webkit.org/changeset/142825
https://bugs.webkit.org/show_bug.cgi?id=109856

Causes some inspector tests to time out (Requested by anttik
on #webkit).

Patch by Sheriff Bot <webkit.review.bot@gmail.com> on 2013-02-14

* platform/mac/SharedTimerMac.mm:
(WebCore):
(WebCore::PowerObserver::restartSharedTimer):
(WebCore::setSharedTimerFireInterval):
(WebCore::stopSharedTimer):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@142907 268f45cc-cd09-0410-ab3c-d52691b4dbfc