Remove OS(WINCE) as blink and chromium does not support WinCe.

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 383 matching lines @@
 /* OS(QNX) - QNX */
 #if defined(__QNXNTO__)
 #define WTF_OS_QNX 1
 #endif
 
 /* OS(SOLARIS) - Solaris */
 #if defined(sun) || defined(__sun)
 #define WTF_OS_SOLARIS 1
 #endif
 
-/* OS(WINCE) - Windows CE; note that for this platform OS(WINDOWS) is also defined */
-#if defined(_WIN32_WCE)
-#define WTF_OS_WINCE 1
-#endif
-
 /* OS(WINDOWS) - Any version of Windows */
 #if defined(WIN32) || defined(_WIN32)
 #define WTF_OS_WINDOWS 1
 #endif
 
 #define WTF_OS_WIN ERROR "USE WINDOWS WITH OS NOT WIN"
 #define WTF_OS_MAC ERROR "USE MAC_OS_X WITH OS NOT MAC"
 
 /* OS(UNIX) - Any Unix-like system */
 #if   OS(AIX)              \
@@ skipping 140 matching lines @@
 #define ENABLE_THREADING_OPENMP 1
 #elif !defined(THREADING_GENERIC)
 #define ENABLE_THREADING_GENERIC 1
 #endif
 
 #if !defined(WTF_USE_ZLIB)
 #define WTF_USE_ZLIB 1
 #endif
 
 #endif /* WTF_Platform_h */