Revert of [Telemetry] Add idle process metrics on OS X > 10.8.4 . (https://codereview.chromium.org/143823019/)

Reason for revert:
mac_power_info is a python script and setuid won't work for such scripts, we need to reimplement it as a binary helper executable.

Original issue's description:
> [Telemetry] Add idle process metrics on OS X > 10.8.4 .
> 
> BUG=338712
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=250016

TBR=tonyg@chromium.org,rsesek@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=338712

Review URL: https://codereview.chromium.org/146713003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250649 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 250649