Undeprecate CreatePeerConnectionFactory which do not use network thread.
Undeprecate CreatePeerConnectionFactory which do not use network thread.

function was deprecated in https://codereview.webrtc.org/1968393002/
in favor of splitting network thread from worker thread.

TBR=pthatcher1
BUG=webrtc:5645

Review URL: https://codereview.webrtc.org/1981273002 .

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#12768}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 2ccfbdf01188f49e495eaf69d499ddfb98656b49

jchavanton/webrtc,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,jchavanton/webrtc,jchavanton/webrtc,jchavanton/webrtc,jchavanton/webrtc,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,jchavanton/webrtc,Alkalyne/webrtctrunk,jchavanton/webrtc,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk