Rename OS(UNIX) to OS(POSIX)

Source/wtf/TCSpinLock.h

 // Copyright (c) 2005, 2006, Google Inc.
 // Copyright (c) 2010, Patrick Gansterer <paroga@paroga.com>
 // All rights reserved.
 //
 // 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.
@@ skipping 16 matching lines @@
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // ---
 // Author: Sanjay Ghemawat <opensource@google.com>
 
 #ifndef TCMALLOC_INTERNAL_SPINLOCK_H__
 #define TCMALLOC_INTERNAL_SPINLOCK_H__
 
-#if OS(UNIX)
+#if OS(POSIX)
 #include <sched.h>
 #endif
 
 #include <pthread.h>
 
 // Portable version
 struct TCMalloc_SpinLock {
   pthread_mutex_t private_lock_;
 
   inline void Init() {
@@ skipping 28 matching lines @@
   inline explicit TCMalloc_SpinLockHolder(TCMalloc_SpinLock* l)
     : lock_(l) { l->Lock(); }
   inline ~TCMalloc_SpinLockHolder() { lock_->Unlock(); }
 };
 
 // Short-hands for convenient use by tcmalloc.cc
 typedef TCMalloc_SpinLock SpinLock;
 typedef TCMalloc_SpinLockHolder SpinLockHolder;
 
 #endif  // TCMALLOC_INTERNAL_SPINLOCK_H__