Stop returning unused return value from QuicPacketCreator::CopyToBuffer.

net/quic/test_tools/quic_packet_creator_peer.cc

Index: net/quic/test_tools/quic_packet_creator_peer.cc
diff --git a/net/quic/test_tools/quic_packet_creator_peer.cc b/net/quic/test_tools/quic_packet_creator_peer.cc
index 83b783c4d385d6716aea1a9272bebb46d793676c..90821dd194c29006f9d3cfd6cbde50463c0a3a6e 100644
--- a/net/quic/test_tools/quic_packet_creator_peer.cc
+++ b/net/quic/test_tools/quic_packet_creator_peer.cc
@@ -70,14 +70,14 @@ void QuicPacketCreatorPeer::FillPacketHeader(QuicPacketCreator* creator,
 }
 
 // static
-size_t QuicPacketCreatorPeer::CreateStreamFrame(QuicPacketCreator* creator,
-                                                QuicStreamId id,
-                                                QuicIOVector iov,
-                                                size_t iov_offset,
-                                                QuicStreamOffset offset,
-                                                bool fin,
-                                                QuicFrame* frame) {
-  return creator->CreateStreamFrame(id, iov, iov_offset, offset, fin, frame);
+void QuicPacketCreatorPeer::CreateStreamFrame(QuicPacketCreator* creator,
+                                              QuicStreamId id,
+                                              QuicIOVector iov,
+                                              size_t iov_offset,
+                                              QuicStreamOffset offset,
+                                              bool fin,
+                                              QuicFrame* frame) {
+  creator->CreateStreamFrame(id, iov, iov_offset, offset, fin, frame);
 }
 
 // static