Revert of Add experiment on weak ping delay during call set up time

Revert of Add experiment on weak ping delay during call set up time (patchset #4 id:60001 of https://codereview.webrtc.org/1411883002/ )

Reason for revert:
guoweis - Here's the target that's failing:
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/libjingle/libjingle_nacl.gyp&l=17

This has unfortunately been causing problems repeatedly for us since libjingle_nacl is maintained separately from libjingle (I don't know the history).

The way this works for Chrome in general is that the FindFullName method is implemented in init_webrtc.cc in the overrides folder in Chrome and that hooks WebRTC up with Chrome's implementation.  I'm not sure if that's the right thing to do for nacl, how webrtc is initialized there etc.  I'll ping the nacl team for some help too offline and include you.  Reverting this change for now.

Original issue's description:
> Add experiment on weak ping delay during call set up time
>
> BUG=
> R=pthatcher@webrtc.org
>
> Committed: https://crrev.com/3bf69b15f4c0c0ca4ab17c237084684a37bb8279
> Cr-Commit-Position: refs/heads/master@{#10343}

TBR=pthatcher@webrtc.org,juberti@webrtc.org,guoweis@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/a01d44022355796d4fd86d00aae6d3263573b6f1
Cr-Commit-Position: refs/heads/master@{#10350}

[tommi, 2015-10-21 08:07:10]

Created Revert of Add experiment on weak ping delay during call set up time

[commit-bot: I haz the power, 2015-10-21 08:07:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1423443002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1423443002/1

[commit-bot: I haz the power, 2015-10-21 08:07:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-21 08:07:41]

Patchset 1 (id:??) landed as
https://crrev.com/a01d44022355796d4fd86d00aae6d3263573b6f1
Cr-Commit-Position: refs/heads/master@{#10350}

[guoweis_webrtc, 2015-10-23 00:49:17]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/1406153005/ by guoweis@webrtc.org.

The reason for reverting is: This should be safe to land now..