Revert of Use standard ICE in Chromoting.

Revert of Use standard ICE in Chromoting. (patchset #7 id:160001 of https://codereview.chromium.org/1085703003/)

Reason for revert:
jingle_unittests failure on Mac ASan 64 Tests (1)

https://build.chromium.org/p/chromium.memory/builders/Mac%20ASan%2064%20Tests%20%281%29/builds/805

BUG=480107
Original issue's description:
> Use standard ICE in Chromoting.
>
> Previously we were using legacy, non-standard version of ICE. This
> change adds ICE version negotiation and enabled standard ICE by default,
> when both peers support it.
>
> BUG=473758
>
> Committed: https://crrev.com/4b35571a3085aa960dcf5533fb2277d5dcaaf11f
> Cr-Commit-Position: refs/heads/master@{#326435}

TBR=rmsousa@chromium.org,wez@chromium.org,dcaiafa@chromium.org,sergeyu@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=473758
Committed: https://crrev.com/372d589d18d9782d8aa2fea2bc6a5d2d37b2ce1b
Cr-Commit-Position: refs/heads/master@{#326458}

[horo, 2015-04-23 05:03:10]

Created Revert of Use standard ICE in Chromoting.

[commit-bot: I haz the power, 2015-04-23 05:03:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1099203005/1

[commit-bot: I haz the power, 2015-04-23 05:04:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-23 05:05:14]

Patchset 1 (id:??) landed as
https://crrev.com/372d589d18d9782d8aa2fea2bc6a5d2d37b2ce1b
Cr-Commit-Position: refs/heads/master@{#326458}

[Sergey Ulanov, 2015-04-23 17:23:11]

On 2015/04/23 05:03:10, horo wrote:
> Created Revert of Use standard ICE in Chromoting.

As explained in the original CL it's not related to jingle_unittests failure.
That test failure looks more like test bot flake, and not related to any code
changes - other test harnesses fail with the same error occasionally on that
bot.