Get rid of OS(SOLARIS) and OS(HURD).

Source/wtf/ThreadIdentifierDataPthreads.cpp

 /*
  * Copyright (C) 2009, 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 19 matching lines @@
 
 #include "config.h"
 
 #if USE(PTHREADS)
 
 #include "wtf/ThreadIdentifierDataPthreads.h"
 
 #include "wtf/Assertions.h"
 #include "wtf/Threading.h"
 
-#if OS(ANDROID) || OS(HURD)
-// PTHREAD_KEYS_MAX is not defined in bionic nor in Hurd, so explicitly define it here.
+#if OS(ANDROID)
+// PTHREAD_KEYS_MAX is not defined in bionic, so explicitly define it here.
 #define PTHREAD_KEYS_MAX 1024
 #else
 #include <limits.h>
 #endif
 
 namespace WTF {
 
 pthread_key_t ThreadIdentifierData::m_key = PTHREAD_KEYS_MAX;
 
 void threadDidExit(ThreadIdentifier);
@@ skipping 34 matching lines @@
     }
 
     threadIdentifierData->m_isDestroyedOnce = true;
     // Re-setting the value for key causes another destruct() call after all other thread-specific destructors were called.
     pthread_setspecific(m_key, threadIdentifierData);
 }
 
 } // namespace WTF
 
 #endif // USE(PTHREADS)