Reduce SpdyHeaderBlock copies with move semantics in shared code.

net/tools/quic/quic_spdy_client_stream.h

 // 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.
 
 #ifndef NET_TOOLS_QUIC_QUIC_SPDY_CLIENT_STREAM_H_
 #define NET_TOOLS_QUIC_QUIC_SPDY_CLIENT_STREAM_H_
 
 #include <stddef.h>
 #include <sys/types.h>
 #include <string>
@@ skipping 41 matching lines @@
   void OnPromiseHeaderList(QuicStreamId promised_id,
                            size_t frame_len,
                            const QuicHeaderList& header_list) override;
 
   // ReliableQuicStream implementation called by the session when there's
   // data for us.
   void OnDataAvailable() override;
 
   // Serializes the headers and body, sends it to the server, and
   // returns the number of bytes sent.
-  size_t SendRequest(const SpdyHeaderBlock& headers,
-                     base::StringPiece body,
-                     bool fin);
+  size_t SendRequest(SpdyHeaderBlock headers, base::StringPiece body, bool fin);
 
   // Returns the response data.
   const std::string& data() { return data_; }
 
   // Returns whatever headers have been received for this stream.
   const SpdyHeaderBlock& response_headers() { return response_headers_; }
 
   size_t header_bytes_read() const { return header_bytes_read_; }
 
   size_t header_bytes_written() const { return header_bytes_written_; }
@@ skipping 27 matching lines @@
   bool allow_bidirectional_data_;
 
   QuicClientSession* session_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSpdyClientStream);
 };
 
 }  // namespace net
 
 #endif  // NET_TOOLS_QUIC_QUIC_SPDY_CLIENT_STREAM_H_