UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:50.0) Gecko/20100101 Firefox/50.0

Steps to reproduce the problem:
1. Open appr.tc in chrome to create a room
2. Join appr.tc from any other browser
3. Dump packet and event recording

What is the expected behavior?
According to RFC: https://tools.ietf.org/html/rfc3550#section-6.4  Chrome should send reception blocks in sender report since it's a sender.

What went wrong?
Chrome sends receiver report while it's also sending sender report without reception block.

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 55.0.2883.95  Channel: n/a
OS Version: OS X 10.11
Flash Version: Shockwave Flash 24.0 r0

Also tested on Chrome 57.0.2960.0 canary, it has the same problem.