Revert of Clean up perftesthelper.js style

Revert of Clean up perftesthelper.js style (patchset #2 id:20001 of https://codereview.chromium.org/927583005/)

Reason for revert:
Tough animation cases are failing due to a few missed files in the refactor.

Original issue's description:
> Clean up perftesthelper.js style
>
> This change makes tools/perf/page_sets/tough_animation_cases/resources/perftesthelper.js
> consistent with the Chromium Javascript style guide:
>  - Fixed indentation
>  - Added missing semicolon
>  - Renamed file to be underscore separated
>
> Committed: https://crrev.com/30a1e4bc96550502e8607ac0f0a246eb42a61852
> Cr-Commit-Position: refs/heads/master@{#316965}

TBR=qyearsley@chromium.org,alancutter@google.com,alancutter@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/c836bb3510711b7866e55e17910ba01db37ab402
Cr-Commit-Position: refs/heads/master@{#317092}

[epenner, 2015-02-19 19:11:46]

Created Revert of Clean up perftesthelper.js style

[commit-bot: I haz the power, 2015-02-19 19:12:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/941773002/1

[commit-bot: I haz the power, 2015-02-19 19:14:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-19 19:16:11]

Patchset 1 (id:??) landed as
https://crrev.com/c836bb3510711b7866e55e17910ba01db37ab402
Cr-Commit-Position: refs/heads/master@{#317092}