Remove WTF_USE_SYSTEM_MALLOC

Source/config.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2013 Apple Inc.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2007-2009 Torch Mobile, Inc.
  * Copyright (C) 2010, 2011 Research In Motion Limited. 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.
@@ skipping 81 matching lines @@
 #else
 #define WTF_USE_ICCJPEG 1
 #define WTF_USE_QCMSLIB 1
 #endif
 
 #if OS(MACOSX)
 #define WTF_USE_CF 1
 #define WTF_USE_RUBBER_BANDING 1
 #endif /* OS(MACOSX) */
 
-// On Mac, the system allocator is the real OS X system allocator.
-// On Android, the system allocator is the libc system allocator.
-// On other platforms, we've overriden the system allocator with tcmalloc.
-// PartitionAlloc seems to be faster than all of these, so on all platforms
-// we use it for a subset of performance sensitive Blink classes (tagged by
-// WTF_MAKE_FAST_ALLOCATED.
-#define WTF_USE_SYSTEM_MALLOC 0
-
 #if OS(POSIX)
 #define HAVE_SIGNAL_H 1
 #define HAVE_SYS_TIME_H 1
 #define WTF_USE_PTHREADS 1
 #endif /* OS(POSIX) */
 
 #if !OS(WIN) && !OS(ANDROID)
 #define HAVE_TM_GMTOFF 1
 #define HAVE_TM_ZONE 1
 #define HAVE_TIMEGM 1
@@ skipping 31 matching lines @@
 
 #if COMPILER(MSVC)
 #define SKIP_STATIC_CONSTRUCTORS_ON_MSVC 1
 #else
 #define SKIP_STATIC_CONSTRUCTORS_ON_GCC 1
 #endif
 
 #if OS(LINUX) || OS(ANDROID) || OS(WIN)
 #define WTF_USE_HARFBUZZ 1
 #endif