[Telemetry] Remove logic that handles case test=None in page_runner.py

[Telemetry] Remove logic that handles case test=None in page_runner.py

Clearly these are not needed since test cannot be None. If
it's None, page_runner.py would crash on line 473.

This patch also renames PageState to _PageState to restrict
access to this outside of page_runner.py

BUG=418278
Committed: https://crrev.com/e9e51e6eb800cc4638441601ef75fd2e69935956
Cr-Commit-Position: refs/heads/master@{#299340}

[nednguyen, 2014-10-13 17:45:31]

Patchset #1 (id:1) has been deleted

[nednguyen, 2014-10-13 17:47:44]

nednguyen@google.com changed reviewers:
+ dtu@chromium.org, tonyg@chromium.org

[tonyg, 2014-10-13 18:07:32]

lgtm % nit

https://codereview.chromium.org/650253002/diff/30001/tools/telemetry/telemetr...
File tools/telemetry/telemetry/page/page_runner.py (right):

https://codereview.chromium.org/650253002/diff/30001/tools/telemetry/telemetr...
tools/telemetry/telemetry/page/page_runner.py:2: #         Use of this source
code is governed by a BSD-style license that can be
stray diff

[nednguyen, 2014-10-13 18:20:35]

The CQ bit was checked by nednguyen@google.com

[commit-bot: I haz the power, 2014-10-13 18:22:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/650253002/180001

[commit-bot: I haz the power, 2014-10-13 19:21:24]

Committed patchset #2 (id:180001)

[commit-bot: I haz the power, 2014-10-13 19:22:15]

Patchset 2 (id:??) landed as
https://crrev.com/e9e51e6eb800cc4638441601ef75fd2e69935956
Cr-Commit-Position: refs/heads/master@{#299340}