Make QuicSpdyStream::ParseHeaderStatusCode() inparam const.

net/quic/quic_spdy_stream.h

 // Copyright 2013 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.
 //
 // The base class for streams which deliver data to/from an application.
 // In each direction, the data on such a stream first contains compressed
 // headers then body data.
 
 #ifndef NET_QUIC_QUIC_SPDY_STREAM_H_
 #define NET_QUIC_QUIC_SPDY_STREAM_H_
@@ skipping 137 matching lines @@
 
   // This block of functions wraps the sequencer's functions of the same
   // name.  These methods return uncompressed data until that has
   // been fully processed.  Then they simply delegate to the sequencer.
   virtual size_t Readv(const struct iovec* iov, size_t iov_len);
   virtual int GetReadableRegions(iovec* iov, size_t iov_len) const;
   void MarkConsumed(size_t num_bytes);
 
   // Returns true if header contains a valid 3-digit status and parse the status
   // code to |status_code|.
-  bool ParseHeaderStatusCode(SpdyHeaderBlock* header, int* status_code) const;
+  bool ParseHeaderStatusCode(const SpdyHeaderBlock& header,
+                             int* status_code) const;
 
   // Returns true when all data has been read from the peer, including the fin.
   bool IsDoneReading() const;
   bool HasBytesToRead() const;
 
   void set_visitor(Visitor* visitor) { visitor_ = visitor; }
 
   bool headers_decompressed() const { return headers_decompressed_; }
 
   const std::string& decompressed_headers() const {
@@ skipping 71 matching lines @@
   std::string decompressed_trailers_;
   // The parsed trailers received from the peer.
   SpdyHeaderBlock received_trailers_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSpdyStream);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SPDY_STREAM_H_