ifdef Snappy's version of DISALLOW_COPY_AND_ASSIGN.

third_party/snappy/win32/snappy-stubs-public.h

 // Copyright 2011 Google Inc. All Rights Reserved.
 // Author: sesse@google.com (Steinar H. Gunderson)
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 62 matching lines @@
 typedef short int16;
 typedef unsigned short uint16;
 typedef int int32;
 typedef unsigned int uint32;
 typedef long long int64;
 typedef unsigned long long uint64;
 #endif
 
 typedef std::string string;
 
+#ifndef DISALLOW_COPY_AND_ASSIGN
 #define DISALLOW_COPY_AND_ASSIGN(TypeName) \
   TypeName(const TypeName&);               \
   void operator=(const TypeName&)
+#endif
 
 #if 1
 // Windows does not have an iovec type, yet the concept is universally useful.
 // It is simple to define it ourselves, so we put it inside our own namespace.
 struct iovec {
   void* iov_base;
   size_t iov_len;
 };
 #endif
 
 // MSVC does not have ssize_t by default; autoconf suggests defining as `int'.
 // Would be in config.h, but Chromium does not use automake/autoconf.
 #include <Windows.h>
 #include <BaseTsd.h>
 typedef SSIZE_T ssize_t;
 
 }  // namespace snappy
 
 #endif  // UTIL_SNAPPY_OPENSOURCE_SNAPPY_STUBS_PUBLIC_H_