Revert of [Android][Telemetry] Add support for multiple power monitors

Revert of [Android][Telemetry] Add support for multiple power monitors (patchset #4 id:60001 of https://codereview.chromium.org/1255673002/)

Reason for revert:
speculative revert: this is the prime suspect for the telemetry_perf_unittests failure on http://build.chromium.org/p/chromium.linux/builders/Android%20Tests%20(dbg)

Original issue's description:
> [Android][Telemetry] Add support for multiple power monitors
>
> BUG=513004
>
> Committed: https://crrev.com/a36acb95c375d4de17277cadbe8d56b45a80d5ce
> Cr-Commit-Position: refs/heads/master@{#340208}

TBR=jdduke@chromium.org,nednguyen@google.com,rnephew@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=513004
Committed: https://crrev.com/d0e348febc608e96bc5ae4ee877f626e2e3fcb38
Cr-Commit-Position: refs/heads/master@{#340271}

[jbudorick, 2015-07-24 14:03:45]

Created Revert of [Android][Telemetry] Add support for multiple power monitors

[commit-bot: I haz the power, 2015-07-24 14:03:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1252923003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1252923003/1

[commit-bot: I haz the power, 2015-07-24 14:04:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-24 14:05:52]

Patchset 1 (id:??) landed as
https://crrev.com/d0e348febc608e96bc5ae4ee877f626e2e3fcb38
Cr-Commit-Position: refs/heads/master@{#340271}

[jbudorick, 2015-07-24 14:21:36]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1252993002/ by jbudorick@chromium.org.

The reason for reverting is: This wasn't actually the cause of the failure..