Don't copy the QuicAckFrame into the QuicPacketGenerator. Protected by quic_dont_copy_acks.

net/quic/test_tools/quic_connection_peer.cc

Index: net/quic/test_tools/quic_connection_peer.cc
diff --git a/net/quic/test_tools/quic_connection_peer.cc b/net/quic/test_tools/quic_connection_peer.cc
index 8f16fc8dbb2793ecdbe986e7a85e8b1e441f2696..0ea74bf88d8871d736a0201f18c10a228341dd32 100644
--- a/net/quic/test_tools/quic_connection_peer.cc
+++ b/net/quic/test_tools/quic_connection_peer.cc
@@ -34,6 +34,12 @@ void QuicConnectionPeer::PopulateAckFrame(QuicConnection* connection,
 }
 
 // static
+const QuicFrame QuicConnectionPeer::GetUpdatedAckFrame(
+    QuicConnection* connection) {
+  return connection->GetUpdatedAckFrame();
+}
+
+// static
 void QuicConnectionPeer::PopulateStopWaitingFrame(
     QuicConnection* connection,
     QuicStopWaitingFrame* stop_waiting) {