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

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
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=261725

[nhiroki, 2014-04-04 10:22:26]

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

[commit-bot: I haz the power, 2014-04-04 10:22:34]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/nhiroki@chromium.org/225683002/1

[commit-bot: I haz the power, 2014-04-04 10:23:56]

Change committed as 261725

[qsr, 2014-04-04 10:57:00]

lgtm