Print the QuicReceivedPacketManager's ack frame instead of the

net/quic/core/quic_packet_generator.h

Index: net/quic/core/quic_packet_generator.h
diff --git a/net/quic/core/quic_packet_generator.h b/net/quic/core/quic_packet_generator.h
index c90e0227467e75cd116223f9ea97bb49ad0be27f..1320dc9d9f0369d93c7582b781c54e0d6a0a1f61 100644
--- a/net/quic/core/quic_packet_generator.h
+++ b/net/quic/core/quic_packet_generator.h
@@ -181,8 +181,6 @@ class NET_EXPORT_PRIVATE QuicPacketGenerator {
     packet_creator_.set_debug_delegate(debug_delegate);
   }
 
-  const QuicAckFrame& pending_ack_frame() const { return pending_ack_frame_; }
-
  private:
   friend class test::QuicPacketGeneratorPeer;
 
@@ -214,7 +212,6 @@ class NET_EXPORT_PRIVATE QuicPacketGenerator {
   // a reference to it until we flush (and serialize it). Retransmittable frames
   // are referenced elsewhere so that they can later be (optionally)
   // retransmitted.
-  QuicAckFrame pending_ack_frame_;
   QuicStopWaitingFrame pending_stop_waiting_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicPacketGenerator);