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

Source/wtf/StringExtras.h

 /*
  * Copyright (C) 2006, 2010 Apple Inc. 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 51 matching lines @@
     if (count > 0)
         buffer[count - 1] = '\0';
 
     return result;
 }
 
 // Work around a difference in Microsoft's implementation of vsnprintf, where 
 // vsnprintf does not null terminate the buffer. WebKit can rely on the null termination.
 #define vsnprintf(buffer, count, format, args) wtf_vsnprintf(buffer, count, format, args)
 
-#if OS(WINCE)
-
-inline int strnicmp(const char* string1, const char* string2, size_t count)
-{
-    return _strnicmp(string1, string2, count);
-}
-
-inline int stricmp(const char* string1, const char* string2)
-{
-    return _stricmp(string1, string2);
-}
-
-inline char* strdup(const char* strSource)
-{
-    return _strdup(strSource);
-}
-
-#endif
-
 inline int strncasecmp(const char* s1, const char* s2, size_t len)
 {
     return _strnicmp(s1, s2, len);
 }
 
 inline int strcasecmp(const char* s1, const char* s2)
 {
     return _stricmp(s1, s2);
 }
 
 #endif
 
 #if !HAVE(STRNSTR)
 
 inline char* strnstr(const char* buffer, const char* target, size_t bufferLength)
 {
     size_t targetLength = strlen(target);
     if (targetLength == 0)
         return const_cast<char*>(buffer);
     for (const char* start = buffer; *start && start + targetLength <= buffer + bufferLength; start++) {
         if (*start == *target && strncmp(start + 1, target + 1, targetLength - 1) == 0)
             return const_cast<char*>(start);
     }
     return 0;
 }
 
 #endif
 
 #endif // WTF_StringExtras_h