Update usrsctp to r8875

TBR=pthatcher@webrt.org
BUG=2749

Review URL: https://webrtc-codereview.appspot.com/16739004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6474 4adac7df-926f-26a2-2b94-8c16560cd09d
Revert 6473 "Update generated asm offsets scripts."

The roll has not been successful. Reverted based on the request of the committer.

> Update generated asm offsets scripts.
> 
> Libvpx updated the unpack scripts to fix building dependencies.
> 
> Roll libvpx 269083:277778
> See https://codereview.chromium.org/295313002/
> https://codereview.chromium.org/298063002/
> https://codereview.chromium.org/305533008/
> https://codereview.chromium.org/305703002/
> https://codereview.chromium.org/298383003/
> https://codereview.chromium.org/302863004/
> https://codereview.chromium.org/320923003/
> https://codereview.chromium.org/325313007/
> for the libvpx changes.
> 
> See https://codereview.chromium.org/313243004/
> for the WebView changes.
> 
> *NOTE* This CL will break the Android bots as they are built in a
> Chromium checkout, which will pull in old libvpx DEPS. They will
> cycle to green when we roll libvpx into Chromium. We must do the
> rolls in this order because we have to land webrtc and libvpx at
> the same time into Chromium.
> 
> BUG=377062
> TBR=andrew@webrtc.org
> 
> Review URL: https://webrtc-codereview.appspot.com/15809004

TBR=fgalligan@google.com

Review URL: https://webrtc-codereview.appspot.com/18589004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6475 4adac7df-926f-26a2-2b94-8c16560cd09d
Revert "Restore ptypes.txt file"

This reverts r6460. It turns out the file was no longer needed after
all.

BUG=2996
TBR=tina.legrand@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/12769004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6478 4adac7df-926f-26a2-2b94-8c16560cd09d
Update PacketSource and RtpFileSource

The NextPacket method should now return NULL when the end of the
source was reached. In the RtpFileSource, this means that when
the end of file is reached, NULL is returned. Also, when an RTCP
packet is encountered, the next packet will be read from file
immediately.

R=kwiberg@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/20699004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6479 4adac7df-926f-26a2-2b94-8c16560cd09d