Keep an instance of QuicAckFrame in QuicConnection in order to reduce

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 9253e5582e9dd2c52697177f37613838fc927d48..1654686c7badad47743e5bf4da4502331a162396 100644
--- a/net/quic/test_tools/quic_connection_peer.cc
+++ b/net/quic/test_tools/quic_connection_peer.cc
@@ -38,14 +38,16 @@ void QuicConnectionPeer::SetSendAlgorithm(
 }
 
 // static
-QuicAckFrame* QuicConnectionPeer::CreateAckFrame(QuicConnection* connection) {
-  return connection->CreateAckFrame();
+void QuicConnectionPeer::PopulateAckFrame(QuicConnection* connection,
+                                          QuicAckFrame* ack) {
+  connection->PopulateAckFrame(ack);
 }
 
 // static
-QuicStopWaitingFrame* QuicConnectionPeer::CreateStopWaitingFrame(
-    QuicConnection* connection) {
-  return connection->CreateStopWaitingFrame();
+void QuicConnectionPeer::PopulateStopWaitingFrame(
+    QuicConnection* connection,
+    QuicStopWaitingFrame* stop_waiting) {
+  connection->PopulateStopWaitingFrame(stop_waiting);
 }
 
 // static