Update pyauto to override IsBrowserTestSuite function

Update pyauto to override IsBrowserTestSuite function

We need this to keep pyauto working until all of the tests have moved over to
telemetry.

BUG=348729
TEST=desktopui_PyAutoInstall and power_LoadTest

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=257224

[danakj, 2014-03-14 01:16:38]

LGTM

[craigdh, 2014-03-14 01:24:32]

lgtm.

[Jorge Lucangeli Obes, 2014-03-14 01:25:06]

lgtm

[dbasehore, 2014-03-14 01:26:29]

The CQ bit was checked by dbasehore@chromium.org

[commit-bot: I haz the power, 2014-03-14 01:26:59]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dbasehore@chromium.org/196023014/1

[commit-bot: I haz the power, 2014-03-14 02:32:16]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-03-14 02:32:17]

Retried try job too often on linux_rel for step(s) telemetry_perf_unittests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[dbasehore, 2014-03-14 19:38:29]

The CQ bit was checked by dbasehore@chromium.org

[commit-bot: I haz the power, 2014-03-14 19:39:30]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dbasehore@chromium.org/196023014/1

[commit-bot: I haz the power, 2014-03-14 22:17:38]

Change committed as 257224