Avoid leaking ThreadingPrimitives.h from StackStats.h when collection is off.

Source/wtf/ThreadingPthreads.cpp

 /*
  * Copyright (C) 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
  * Copyright (C) 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
@@ skipping 20 matching lines @@
 #include "config.h"
 #include "wtf/Threading.h"
 
 #if USE(PTHREADS)
 
 #include "wtf/DateMath.h"
 #include "wtf/HashMap.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RandomNumberSeed.h"
-#include "wtf/StackStats.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/ThreadFunctionInvocation.h"
 #include "wtf/ThreadIdentifierDataPthreads.h"
 #include "wtf/ThreadSpecific.h"
+#include "wtf/ThreadingPrimitives.h"
 #include "wtf/UnusedParam.h"
 #include "wtf/WTFThreadData.h"
 #include "wtf/dtoa.h"
 #include "wtf/dtoa/cached-powers.h"
 #include <errno.h>
 
 #if !COMPILER(MSVC)
 #include <limits.h>
 #include <sched.h>
 #include <sys/time.h>
@@ skipping 60 matching lines @@
     ASSERT(!atomicallyInitializedStaticMutex);
 
     WTF::double_conversion::initialize();
     // StringImpl::empty() does not construct its static string in a threadsafe fashion,
     // so ensure it has been initialized from here.
     StringImpl::empty();
     atomicallyInitializedStaticMutex = new Mutex;
     threadMapMutex();
     initializeRandomNumberGenerator();
     ThreadIdentifierData::initializeOnce();
-    StackStats::initialize();
     wtfThreadData();
     s_dtoaP5Mutex = new Mutex;
     initializeDates();
 }
 
 void lockAtomicallyInitializedStaticMutex()
 {
     ASSERT(atomicallyInitializedStaticMutex);
     atomicallyInitializedStaticMutex->lock();
 }
@@ skipping 249 matching lines @@
 
 void ThreadCondition::broadcast()
 {
     int result = pthread_cond_broadcast(&m_condition);
     ASSERT_UNUSED(result, !result);
 }
 
 } // namespace WTF
 
 #endif // USE(PTHREADS)