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

net/quic/core/quic_ack_listener_interface.cc

Index: net/quic/core/quic_ack_listener_interface.cc
diff --git a/net/quic/core/quic_ack_listener_interface.cc b/net/quic/core/quic_ack_listener_interface.cc
index 07700f09435ab442d2fe1ab68c3cea81470025b2..e599d594e9576d95c2c718773153151a5e73e424 100644
--- a/net/quic/core/quic_ack_listener_interface.cc
+++ b/net/quic/core/quic_ack_listener_interface.cc
@@ -7,11 +7,9 @@
 namespace net {
 
 AckListenerWrapper::AckListenerWrapper(
-    const scoped_refptr<QuicAckListenerInterface>& listener,
+    scoped_refptr<QuicAckListenerInterface> listener,
     QuicPacketLength data_length)
-    : ack_listener(listener), length(data_length) {
-  DCHECK(listener != nullptr);
-}
+    : ack_listener(std::move(listener)), length(data_length) {}
 
 AckListenerWrapper::AckListenerWrapper(const AckListenerWrapper& other) =
     default;