Revert of [Telemetry] Fix WPR files not being downloaded when required.

Revert of [Telemetry] Fix WPR files not being downloaded when required. (patchset #4 id:60001 of https://codereview.chromium.org/834173006/)

Reason for revert:
Possible suspect for newly introduced telemetry unit test flake, e.g.:

https://build.chromium.org/p/chromium.mac/builders/Mac10.9%20Tests%20%28dbg%29/builds/1965/steps/telemetry_unittests/logs/stdio

Reverting to see what happens.

Original issue's description:
> [Telemetry] Fix WPR files not being downloaded when required.
>
> BUG=
>
> Committed: https://crrev.com/672e7140315568e9bfc442770a23fee66e045cb2
> Cr-Commit-Position: refs/heads/master@{#311496}

TBR=nednguyen@google.com,aiolos@chromium.org,lizeb@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/6041d4206970522a18f49afb1ba069651dc22ba2
Cr-Commit-Position: refs/heads/master@{#311551}

[Ken Rockot(use gerrit already), 2015-01-14 22:07:57]

Created Revert of [Telemetry] Fix WPR files not being downloaded when required.

[commit-bot: I haz the power, 2015-01-14 22:08:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/852863003/1

[commit-bot: I haz the power, 2015-01-14 22:10:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-14 22:11:19]

Patchset 1 (id:??) landed as
https://crrev.com/6041d4206970522a18f49afb1ba069651dc22ba2
Cr-Commit-Position: refs/heads/master@{#311551}

[Ken Rockot(use gerrit already), 2015-01-15 00:34:48]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/794363005/ by rockot@chromium.org.

The reason for reverting is: Reverting my revert because it didn't fix the
flake! Churn, churn, churn....