Cleanup: Pass std::string as const reference from net/

net/quic/quic_stream_sequencer.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_stream_sequencer.h"
 
 #include <algorithm>
 #include <limits>
 #include <utility>
 
 #include "base/logging.h"
 #include "net/quic/reliable_quic_stream.h"
 
 using std::min;
 using std::numeric_limits;
 using std::string;
 
 namespace net {
 
 QuicStreamSequencer::FrameData::FrameData(QuicStreamOffset offset,
-                                          string segment)
+                                          const string& segment)
     : offset(offset), segment(segment) {}
 
 QuicStreamSequencer::QuicStreamSequencer(ReliableQuicStream* quic_stream)
     : stream_(quic_stream),
       num_bytes_consumed_(0),
       close_offset_(numeric_limits<QuicStreamOffset>::max()),
       blocked_(false),
       num_bytes_buffered_(0),
       num_frames_received_(0),
       num_duplicate_frames_received_(0),
@@ skipping 257 matching lines @@
 }
 
 void QuicStreamSequencer::RecordBytesConsumed(size_t bytes_consumed) {
   num_bytes_consumed_ += bytes_consumed;
   num_bytes_buffered_ -= bytes_consumed;
 
   stream_->AddBytesConsumed(bytes_consumed);
 }
 
 }  // namespace net