Revert of Log force-alt-protocols command line flag usage. (patchset #2 id:20001 of https://coderev…

Revert of "Log force-alt-protocols command line flag usage".

Revert of "Log force-alt-protocols command line flag usage" (patchset #2 id:20001 of https://codereview.chromium.org/879863004/).  Created manually by git revert ; git cl upload.

Reason for revert:
Reverting bogus CL.  base::RecordAction cannot be called on the IO thread.  This
CL actually causes debug build Chromium to crash upon startup if invoked with
the --use-spdy=force-alt-protocols command line flag.

Nothing else in io_thread.cc seems to be using "base/metrics/user_metrics.h", so
it seems to be safe to remove.

Original issue's description:
> Log force-alt-protocols command line flag usage.
>
> BUG=452514
>
> Committed: https://crrev.com/493bc568527caeab93a173e4feea85c0c86c439e
> Cr-Commit-Position: refs/heads/master@{#313566}

TBR=rch@chromium.org,asvitkine@chromium.org
BUG=452514
Committed: https://crrev.com/206a16f0cdea031978c07fa6231a4b09be03db31
Cr-Commit-Position: refs/heads/master@{#321343}

[Bence, 2015-03-19 12:48:39]

The CQ bit was checked by bnc@chromium.org

[commit-bot: I haz the power, 2015-03-19 12:48:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1023483002/1

[commit-bot: I haz the power, 2015-03-19 12:57:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-19 12:58:13]

Patchset 1 (id:??) landed as
https://crrev.com/206a16f0cdea031978c07fa6231a4b09be03db31
Cr-Commit-Position: refs/heads/master@{#321343}