Remove unused method releaseFastMallocFreeMemory

Source/wtf/FastMalloc.h

 /*
  *  Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 19 matching lines @@
 WTF_EXPORT void fastMallocShutdown();
 
 // These functions crash safely if an allocation fails.
 WTF_EXPORT void* fastMalloc(size_t);
 WTF_EXPORT void* fastZeroedMalloc(size_t);
 WTF_EXPORT void* fastRealloc(void*, size_t);
 WTF_EXPORT char* fastStrDup(const char*);
 
 WTF_EXPORT void fastFree(void*);
 
-WTF_EXPORT void releaseFastMallocFreeMemory();
-
 struct FastMallocStatistics {
     size_t reservedVMBytes;
     size_t committedVMBytes;
     size_t freeListBytes;
 };
 WTF_EXPORT FastMallocStatistics fastMallocStatistics();
 
 } // namespace WTF
 
 using WTF::fastFree;
 using WTF::fastMalloc;
 using WTF::fastRealloc;
 using WTF::fastStrDup;
 using WTF::fastZeroedMalloc;
 
 #endif /* WTF_FastMalloc_h */