Consider merging https://chromium.googlesource.com/chromium/blink/+/415abb016c34a595d8c2d3b0d62d8b804d734ee2 This has been discussed and approved on the W3C email list. The main reason is the TURN URI Spec will(has) removed the username component.
*** This bug has been marked as a duplicate of bug 120861 ***