Remove OS(IOS) and OS(MAC_OS_X) guards.

Source/wtf/Platform.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007-2009 Torch Mobile, Inc.
  * Copyright (C) 2010, 2011 Research In Motion Limited. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 303 matching lines @@
 
 /* OS(DARWIN) - Any Darwin-based OS, including Mac OS X and iPhone OS */
 #ifdef __APPLE__
 #define WTF_OS_DARWIN 1
 
 #include <Availability.h>
 #include <AvailabilityMacros.h>
 #include <TargetConditionals.h>
 #endif
 
-/* OS(IOS) - iOS */
-/* OS(MAC_OS_X) - Mac OS X (not including iOS) */
-#if OS(DARWIN) && ((defined(TARGET_OS_EMBEDDED) && TARGET_OS_EMBEDDED) \
-    || (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE)                 \
-    || (defined(TARGET_IPHONE_SIMULATOR) && TARGET_IPHONE_SIMULATOR))
-#define WTF_OS_IOS 1
-#elif OS(DARWIN) && defined(TARGET_OS_MAC) && TARGET_OS_MAC
-#define WTF_OS_MAC_OS_X 1
-#endif
-
 /* OS(FREEBSD) - FreeBSD */
 #if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
 #define WTF_OS_FREEBSD 1
 #endif
 
 /* OS(HURD) - GNU/Hurd */
 #ifdef __GNU__
 #define WTF_OS_HURD 1
 #endif
 
@@ skipping 137 matching lines @@
 
 #if !defined(ENABLE_THREADING_LIBDISPATCH) && HAVE(DISPATCH_H)
 #define ENABLE_THREADING_LIBDISPATCH 1
 #elif !defined(ENABLE_THREADING_OPENMP) && defined(_OPENMP)
 #define ENABLE_THREADING_OPENMP 1
 #elif !defined(THREADING_GENERIC)
 #define ENABLE_THREADING_GENERIC 1
 #endif
 
 #endif /* WTF_Platform_h */