Move net/base/sys_byteorder.h to base/sys_byteorder.h

Two motivations:
  (1) There are currently clients in src/crypto that need the same logic.
  (2) There is soon to be a client in src/chrome/common that needs the 64-bit version of this logic, which is currently inlined in a src/crypto implementation file.

BUG=103480
TEST=compiles


Review URL: http://codereview.chromium.org/8949026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@115926 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/net/dns/dns_config_service_posix_unittest.cc b/net/dns/dns_config_service_posix_unittest.cc
index a3f90aa..ab9e56d 100644
--- a/net/dns/dns_config_service_posix_unittest.cc
+++ b/net/dns/dns_config_service_posix_unittest.cc
@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include <arpa/inet.h>
 #include <resolv.h>
 
+#include "base/sys_byteorder.h"
 #include "net/dns/dns_config_service_posix.h"
 
 #include "testing/gtest/include/gtest/gtest.h"