Roll webrtc to r5549. Major change in this revision is addition of PacketOptions structure to every packet sent over network in AsyncPacketSocket::Send methods.

This structure has information about parameters required for packet authentication outside libsrtp.

R=ronghuawu@chromium.org, sergeyu@chromium.org

Review URL: https://codereview.chromium.org/167893002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251548 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251549 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251549