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

net/quic/core/quic_headers_stream.h

Index: net/quic/core/quic_headers_stream.h
diff --git a/net/quic/core/quic_headers_stream.h b/net/quic/core/quic_headers_stream.h
index 2c2b6dcd8a3e7e79398ea9fd65ef411f29fec4af..7ca6e9dbd69d59d14865f66da5b6aceabd94e5ae 100644
--- a/net/quic/core/quic_headers_stream.h
+++ b/net/quic/core/quic_headers_stream.h
@@ -56,7 +56,7 @@ class QUIC_EXPORT_PRIVATE QuicHeadersStream : public QuicStream {
       SpdyHeaderBlock headers,
       bool fin,
       SpdyPriority priority,
-      const scoped_refptr<QuicAckListenerInterface>& ack_listener);
+      scoped_refptr<QuicAckListenerInterface> ack_listener);
 
   // Write |headers| for |promised_stream_id| on |original_stream_id| in a
   // PUSH_PROMISE frame to peer.
@@ -72,7 +72,7 @@ class QUIC_EXPORT_PRIVATE QuicHeadersStream : public QuicStream {
       QuicIOVector iov,
       QuicStreamOffset offset,
       bool fin,
-      const scoped_refptr<QuicAckListenerInterface>& ack_notifier_delegate);
+      scoped_refptr<QuicAckListenerInterface> ack_notifier_delegate);
 
   // QuicStream implementation
   void OnDataAvailable() override;
@@ -145,7 +145,7 @@ class QUIC_EXPORT_PRIVATE QuicHeadersStream : public QuicStream {
       QuicStreamId stream_id,
       base::StringPiece data,
       bool fin,
-      const scoped_refptr<QuicAckListenerInterface>& ack_notifier_delegate);
+      scoped_refptr<QuicAckListenerInterface> ack_notifier_delegate);
 
   // Returns true if the session is still connected.
   bool IsConnected();