Update webrtc/libjingle 5523:5548.

This is a clone of https://codereview.chromium.org/166753002/ + changes to handle OPT_RTP_SENDTIME_EXTN_ID in ipc_socket_factory.cc.

R=mallinath@chromium.org, wjia@chromium.org, xians@chromium.org
TBR=sergeyu

Review URL: https://codereview.chromium.org/167313002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251415 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251416 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251416