Revert of Fix power measurement with dumpsys when the format is unrecognized. (https...

Revert of Fix power measurement with dumpsys when the format is unrecognized. (https://codereview.chromium.org/225493003/)

Reason for revert:
This seems to break telemetry_unittests on Mac and Linux.

http://build.chromium.org/p/chromium.mac/builders/Mac10.7%20Tests%20%283%29/builds/25648
http://build.chromium.org/p/chromium.linux/buildstatus?builder=Linux%20Tests&number=10049

Original issue's description:
> Fix power measurement with dumpsys when the format is unrecognized.
>
> dumpsys information for older release of android doesn't contain the
> needed information. This CL prevent the application to crash in that
> case.
>
> BUG=359883
> TBR=tonyg@chromium.org
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=261708

TBR=tonyg@chromium.org,qsr@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=359883

Review URL: https://codereview.chromium.org/225683002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@261725 0039d316-1c4b-4281-b951-d872f2087c98