Revert of Added send-thresholding and fixed text packet dumping.

Revert of Added send-thresholding and fixed text packet dumping. (patchset #4 id:160001 of https://codereview.webrtc.org/1266033005/ )

Reason for revert:
The CL adds a global variable.

Original issue's description:
> Added send-thresholding and fixed text packet dumping.  Also a little squelch for the over-max-MTU log spam we see in there.
>
> BUG=https://code.google.com/p/webrtc/issues/detail?id=4468
> R=pthatcher@chromium.org, pthatcher@webrtc.org
>
> Committed: https://chromium.googlesource.com/external/webrtc/+/d838d2791979bb50f464a61c557d55c6a324621e

TBR=pthatcher@webrtc.org,bemasc@webrtc.org,pthatcher@chromium.org,thakis@chromium.org,lally@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=https://code.google.com/p/webrtc/issues/detail?id=4468

Committed: https://crrev.com/7391881f9762ccadeeb0249560b33cf2bcfaf7f9
Cr-Commit-Position: refs/heads/master@{#9796}

[tommi, 2015-08-27 11:29:48]

Created Revert of Added send-thresholding and fixed text packet dumping.

[commit-bot: I haz the power, 2015-08-27 11:29:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1315923003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1315923003/1

[commit-bot: I haz the power, 2015-08-27 11:30:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-27 11:30:14]

Patchset 1 (id:??) landed as
https://crrev.com/7391881f9762ccadeeb0249560b33cf2bcfaf7f9
Cr-Commit-Position: refs/heads/master@{#9796}