Revert of Add a new enable_nonblocking_io field trial param for QUIC

Revert of Add a new enable_nonblocking_io field trial param for QUIC (patchset #6 id:120001 of https://codereview.chromium.org/938003003/)

Reason for revert:
Speculative revert to see whether this affects some tests that involve loading fonts in gfx_unittests (see failures at http://build.chromium.org/p/chromium.linux/builders/Linux%20Tests%20%28dbg%29%281%29).

Original issue's description:
> Add a new enable_nonblocking_io field trial param for QUIC which enables the new non-blocking IO support on windows.
>
> BUG=442392
>
> Committed: https://crrev.com/83e8c1477cf5d41928b8c9035f0c4812828752f4
> Cr-Commit-Position: refs/heads/master@{#318555}

TBR=rtenneti@chromium.org,rch@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=442392
Committed: https://crrev.com/369bca8b735e6275616052b9b9e3755f3305eb1f
Cr-Commit-Position: refs/heads/master@{#318601}

[qyearsley, 2015-02-28 06:11:45]

Created Revert of Add a new enable_nonblocking_io field trial param for QUIC

[commit-bot: I haz the power, 2015-02-28 06:11:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/970513004/1

[commit-bot: I haz the power, 2015-02-28 06:12:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-28 06:13:07]

Patchset 1 (id:??) landed as
https://crrev.com/369bca8b735e6275616052b9b9e3755f3305eb1f
Cr-Commit-Position: refs/heads/master@{#318601}

[qyearsley, 2015-02-28 06:57:43]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/968573002/ by qyearsley@chromium.org.

The reason for reverting is: Revert apparently didn't help, still failing:
http://build.chromium.org/p/chromium.linux/builders/Linux%20Tests%20%28dbg%29....

[ramant (doing other things), 2015-03-01 02:00:40]

lgtm

I doubt this CL is the reason.