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

net/quic/chromium/quic_chromium_client_stream.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/chromium/quic_chromium_client_stream.h"
 
 #include <utility>
 
 #include "base/bind_helpers.h"
 #include "base/callback_helpers.h"
@@ skipping 105 matching lines @@
   QuicStream::OnCanWrite();
 
   if (!HasBufferedData() && !callback_.is_null()) {
     base::ResetAndReturn(&callback_).Run(OK);
   }
 }
 
 size_t QuicChromiumClientStream::WriteHeaders(
     SpdyHeaderBlock header_block,
     bool fin,
-    const scoped_refptr<QuicAckListenerInterface>& ack_notifier_delegate) {
+    scoped_refptr<QuicAckListenerInterface> ack_notifier_delegate) {
   if (!session()->IsCryptoHandshakeConfirmed()) {
     auto entry = header_block.find(":method");
     DCHECK(entry != header_block.end());
     DCHECK_NE("POST", entry->second);
   }
   net_log_.AddEvent(
       NetLogEventType::QUIC_CHROMIUM_CLIENT_STREAM_SEND_REQUEST_HEADERS,
       base::Bind(&QuicRequestNetLogCallback, id(), &header_block,
                  QuicSpdyStream::priority()));
   return QuicSpdyStream::WriteHeaders(std::move(header_block), fin,
-                                      ack_notifier_delegate);
+                                      std::move(ack_notifier_delegate));
 }
 
 SpdyPriority QuicChromiumClientStream::priority() const {
   if (delegate_ && delegate_->HasSendHeadersComplete()) {
     return QuicSpdyStream::priority();
   }
   return net::kV3HighestPriority;
 }
 
 int QuicChromiumClientStream::WriteStreamData(
@@ skipping 136 matching lines @@
 
 void QuicChromiumClientStream::DisableConnectionMigration() {
   can_migrate_ = false;
 }
 
 bool QuicChromiumClientStream::IsFirstStream() {
   return id() == kHeadersStreamId + 2;
 }
 
 }  // namespace net