Fixed todo by replacing SequenceNumberUnwrapper with updated class SeqNumUnwrapper that correctly handles reordering of early packets. Bug: webrtc:10263 Change-Id: Iffd93db924fee132d35752996b8d29acbb315d24 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/130498 Reviewed-by: Philip Eliasson <philipel@webrtc.org> Commit-Queue: Johannes Kron <kron@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27417}