Revert of Set power_metric state to False when test closed (patchset #3 id:40001 of https://codereview.chromium.org/1588033005/ )
Revert of Set power_metric state to False when test closed (patchset #3 id:40001 of https://codereview.chromium.org/1588033005/ )

Reason for revert:
Broke tab_switching.typical_25 on all perf bots
http://crbug.com/579511

Original issue's description:
> Set power_metric state to False when test closed
>
> BUG=577975
>
> Committed: https://crrev.com/ff3a0529b3cea0ac26579e71e6da8796bf86ebf2
> Cr-Commit-Position: refs/heads/master@{#370174}

TBR=rnephew@google.com,nednguyen@google.com,mikecase@chromium.org,jbudorick@chromium.org,rnephew@chromium.org,yolandyan@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=577975

Review URL: https://codereview.chromium.org/1610623002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#370392}

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