Added DISALLOW_COPY_AND_ASSIGN to disable copy/assign.

net/quic/quic_data_writer.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_QUIC_QUIC_DATA_WRITER_H_
 #define NET_QUIC_QUIC_DATA_WRITER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 56 matching lines @@
 
  private:
   // Returns the location that the data should be written at, or NULL if there
   // is not enough room. Call EndWrite with the returned offset and the given
   // length to pad out for the next write.
   char* BeginWrite(size_t length);
 
   char* buffer_;
   size_t capacity_;  // Allocation size of payload (or -1 if buffer is const).
   size_t length_;    // Current length of the buffer.
+
+  DISALLOW_COPY_AND_ASSIGN(QuicDataWriter);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_DATA_WRITER_H_