Merge third_party/usrsctp/usrsctplib from https://chromium.googlesource.com/external/usrsctplib.git at 368d86efa422ae7e549399f8c35783c0e80232f0

This commit was generated by merge_from_chromium.py.

Change-Id: I70d334466b9f7391c8a59d94d741bd281d61441d