Revert of Telemetry: Use the leftmost argument to find the test to parse flags.

Revert of Telemetry: Use the leftmost argument to find the test to parse flags. (patchset #2 id:20001 of https://codereview.chromium.org/582793002/)

Reason for revert:
Broke Android debug gpu bot:
http://build.chromium.org/p/chromium.gpu/builders/Android%20Debug%20%28Nexus%207%29/builds/12692

This bot relies on being able to supply some flags before the test name; it runs:
content/test/gpu/run_gpu_test.py --browser=android-content-shell webgl_conformance --webgl-conformance-version=1.0.1

Original issue's description:
> Telemetry: Use the leftmost argument to find the test to parse flags.
>
> Previously it would check all of the arguments, and use the last test found.
> This is causes problems as different tests can be used to create the parser and
> accepts the parsed flags.
>
> SHERIFFS: If errors related to parsing flags for run_measurement, run_benchmark
> or run_gpu_test.py appear, this is likely the cause. It is safe to revert.
>
> BUG=413334
>
> Committed: https://crrev.com/5afe5a61f03743bd523dae66f662ad773f8befb9
> Cr-Commit-Position: refs/heads/master@{#295738}

TBR=nednguyen@google.com,kbr@chromium.org,tonyg@chromium.org,dtu@chromium.org,ariblue@google.com
NOTREECHECKS=true
NOTRY=true
BUG=413334
Committed: https://crrev.com/a66c92ff74876c9bd5a025a1bfa544956f0db94c
Cr-Commit-Position: refs/heads/master@{#295765}

[jbroman, 2014-09-19 19:31:15]

Created Revert of Telemetry: Use the leftmost argument to find the test to parse
flags.

[commit-bot: I haz the power, 2014-09-19 19:32:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/584023003/1

[commit-bot: I haz the power, 2014-09-19 19:33:03]

Committed patchset #1 (id:1) as 0fc33036c06ae0706a6aa0c69a5cff17d7d74f5c

[commit-bot: I haz the power, 2014-09-19 19:34:05]

Patchset 1 (id:??) landed as
https://crrev.com/a66c92ff74876c9bd5a025a1bfa544956f0db94c
Cr-Commit-Position: refs/heads/master@{#295765}