Pass value and use std::move instead of const reference for ack listeners.

net/tools/quic/quic_simple_server_session_test.cc

Index: net/tools/quic/quic_simple_server_session_test.cc
diff --git a/net/tools/quic/quic_simple_server_session_test.cc b/net/tools/quic/quic_simple_server_session_test.cc
index b674915a1a5421dfaf939844e81bf61a0f9d8ebd..d857bee9455471fdd6622f8d59205f8654c9acbe 100644
--- a/net/tools/quic/quic_simple_server_session_test.cc
+++ b/net/tools/quic/quic_simple_server_session_test.cc
@@ -84,7 +84,7 @@ class MockQuicHeadersStream : public QuicHeadersStream {
       SpdyHeaderBlock headers,
       bool fin,
       SpdyPriority priority,
-      const scoped_refptr<QuicAckListenerInterface>& ack_listener) override {
+      scoped_refptr<QuicAckListenerInterface> ack_listener) override {
     return WriteHeadersMock(stream_id, headers, fin, priority, ack_listener);
   }
   MOCK_METHOD5(
@@ -139,7 +139,7 @@ class MockQuicConnectionWithSendStreamData : public MockQuicConnection {
                        QuicIOVector iov,
                        QuicStreamOffset offset,
                        bool fin,
-                       const scoped_refptr<QuicAckListenerInterface>& listern));
+                       scoped_refptr<QuicAckListenerInterface> listern));
 };
 
 class QuicSimpleServerSessionPeer {