Further simplify QUIC's UnackedPacketMap now that the interface is

net/quic/quic_protocol.h

Index: net/quic/quic_protocol.h
diff --git a/net/quic/quic_protocol.h b/net/quic/quic_protocol.h
index 7d46719713ee0b4b141ded6578867221affb5f82..96e18d42dd0c3eef9e6bbf1bb5775228ece99cb0 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -1063,14 +1063,9 @@ struct NET_EXPORT_PRIVATE TransmissionInfo {
   // Constructs a Transmission with a new all_tranmissions set
   // containing |sequence_number|.
   TransmissionInfo(RetransmittableFrames* retransmittable_frames,
-                   QuicSequenceNumberLength sequence_number_length);
-
-  // Constructs a Transmission with the specified |all_tranmissions| set
-  // and inserts |sequence_number| into it.
-  TransmissionInfo(RetransmittableFrames* retransmittable_frames,
                    QuicSequenceNumberLength sequence_number_length,
                    TransmissionType transmission_type,
-                   SequenceNumberList* all_transmissions);
+                   QuicTime sent_time);
 
   RetransmittableFrames* retransmittable_frames;
   QuicSequenceNumberLength sequence_number_length;