Reland "Remove GICE (gone forever!) and PORTALLOCATOR_ENABLE_SHARED_UFRAG (enabled forever)." becauese remoting code is using dead constants and breaks the FYI bots.

This reverts commit 5bdafd44c86ee46bd7e040f19828324583418b33.

Original CL: https://codereview.webrtc.org/1263663002/

R=guoweis@webrtc.org

Review URL: https://codereview.webrtc.org/1303393002 .

Cr-Commit-Position: refs/heads/master@{#9761}
48 files changed