Avoid loading ws2_32.dll just to get htons() and friends.

base/sys_byteorder.h

 // Copyright (c) 2011 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.
 
 // This is a convenience header to pull in the platform-specific
 // headers that define functions for byte-order conversion,
 // particularly: ntohs(), htons(), ntohl(), htonl(). Prefer including
 // this file instead of directly writing the #if / #else, since it
 // avoids duplicating the platform-specific selections.
 // This header also provides ntohll() and htonll() for byte-order conversion
@@ skipping 15 matching lines @@
 #if defined(COMPILER_MSVC)
 #include <stdlib.h>
 #elif defined(OS_MACOSX)
 #include <libkern/OSByteOrder.h>
 #elif defined(OS_OPENBSD)
 #include <sys/endian.h>
 #else
 #include <byteswap.h>
 #endif
 
-
 namespace base {
 
 // Returns a value with all bytes in |x| swapped, i.e. reverses the endianness.
 inline uint64 ByteSwap(uint64 x) {
 #if defined(COMPILER_MSVC)
   return _byteswap_uint64(x);
 #elif defined(OS_MACOSX)
   return OSSwapInt64(x);
 #elif defined(OS_OPENBSD)
   return swap64(x);
@@ skipping 19 matching lines @@
   return ByteSwap(x);
 #else
   return x;
 #endif
 }
 
 }  // namespace base
 
 
 #endif  // BASE_SYS_BYTEORDER_H_