Move QuicAckListenerInterface, QuicPendingRetransmission, and QuicTransmissionInfo out of quic_pack…

net/quic/core/quic_connection.cc

Index: net/quic/core/quic_connection.cc
diff --git a/net/quic/core/quic_connection.cc b/net/quic/core/quic_connection.cc
index 2321912c3b583f4588fef3305421587413eea953..61b14b8fb7edee71a9ec96bdbb644850f56f8ebf 100644
--- a/net/quic/core/quic_connection.cc
+++ b/net/quic/core/quic_connection.cc
@@ -34,6 +34,7 @@
 #include "net/quic/core/quic_config.h"
 #include "net/quic/core/quic_flags.h"
 #include "net/quic/core/quic_packet_generator.h"
+#include "net/quic/core/quic_pending_retransmission.h"
 #include "net/quic/core/quic_sent_packet_manager.h"
 #include "net/quic/core/quic_utils.h"
 
@@ -1443,7 +1444,7 @@ void QuicConnection::WritePendingRetransmissions() {
   // Keep writing as long as there's a pending retransmission which can be
   // written.
   while (sent_packet_manager_->HasPendingRetransmissions()) {
-    const PendingRetransmission pending =
+    const QuicPendingRetransmission pending =
         sent_packet_manager_->NextPendingRetransmission();
     if (!CanWrite(HAS_RETRANSMITTABLE_DATA)) {
       break;