TransportFeedbackPacketLossTracker to receive std::vector<PacketFeedback> in place of the entire feedback

BUG=webrtc:7058

Review-Url: https://codereview.webrtc.org/2754373002
Cr-Original-Commit-Position: refs/heads/master@{#17322}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 92e448d5294b6efe6edb610090d28e07531801d8
4 files changed