Reduce SpdyHeaderBlock copies with move semantics in shared code.

net/quic/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/quic_chromium_client_stream.h"
 
+#include <utility>
+
 #include "base/callback_helpers.h"
 #include "base/location.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/quic/quic_chromium_client_session.h"
 #include "net/quic/quic_http_utils.h"
 #include "net/quic/quic_spdy_session.h"
 #include "net/quic/quic_write_blocked_list.h"
 #include "net/quic/spdy_utils.h"
@@ skipping 112 matching lines @@
 
 void QuicChromiumClientStream::OnCanWrite() {
   ReliableQuicStream::OnCanWrite();
 
   if (!HasBufferedData() && !callback_.is_null()) {
     base::ResetAndReturn(&callback_).Run(OK);
   }
 }
 
 size_t QuicChromiumClientStream::WriteHeaders(
-    const SpdyHeaderBlock& header_block,
+    SpdyHeaderBlock header_block,
     bool fin,
     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(
       NetLog::TYPE_QUIC_CHROMIUM_CLIENT_STREAM_SEND_REQUEST_HEADERS,
       base::Bind(&QuicRequestNetLogCallback, id(), &header_block,
                  QuicSpdyStream::priority()));
-  return QuicSpdyStream::WriteHeaders(header_block, fin, ack_notifier_delegate);
+  return QuicSpdyStream::WriteHeaders(std::move(header_block), fin,
+                                      ack_notifier_delegate);
 }
 
 SpdyPriority QuicChromiumClientStream::priority() const {
   if (delegate_ && delegate_->HasSendHeadersComplete()) {
     return QuicSpdyStream::priority();
   }
   return net::kV3HighestPriority;
 }
 
 int QuicChromiumClientStream::WriteStreamData(
@@ skipping 126 matching lines @@
   } else {
     delegate_tasks_.push_back(closure);
   }
 }
 
 void QuicChromiumClientStream::DisableConnectionMigration() {
   can_migrate_ = false;
 }
 
 }  // namespace net