1. Create a new sandbox type which allows access to Unix sockets in the Mac...

chrome/test/nacl/nacl_test.cc

Index: chrome/test/nacl/nacl_test.cc
===================================================================
--- chrome/test/nacl/nacl_test.cc	(revision 43339)
+++ chrome/test/nacl/nacl_test.cc	(working copy)
@@ -62,9 +62,7 @@
   // Currently we disable some of the sandboxes.  See:
   // Make NaCl work in Chromium's Linux seccomp sandbox and the Mac sandbox
   // http://code.google.com/p/nativeclient/issues/detail?id=344
-#if defined(OS_MACOSX)
-  launch_arguments_.AppendSwitch(switches::kNoSandbox);
-#elif defined(OS_LINUX) && defined(USE_SECCOMP_SANDBOX)
+#if defined(OS_LINUX) && defined(USE_SECCOMP_SANDBOX)
   launch_arguments_.AppendSwitch(switches::kDisableSeccompSandbox);
 #endif
 }