PacketList is now list<Packet> instead of list<Packet*>. Splicing the lists in NetEqImpl::InsertPacketInternal instead of moving packets. Avoid moving the packet when doing Rfc3389Cng. Removed PacketBuffer::DeleteFirstPacket and DeleteAllPackets. BUG=chromium:657300 Review-Url: https://codereview.webrtc.org/2425223002 Cr-Commit-Position: refs/heads/master@{#14747}