[oilpan] Make the oilpan branch build on Mac.

Source/wtf/ValueCheck.h

 /*
  * Copyright (C) 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 24 matching lines @@
     static void checkConsistency(const T&) { }
 };
 
 #if !ASSERT_DISABLED
 template<typename P> struct ValueCheck<P*> {
     typedef P* TraitType;
     static void checkConsistency(const P* p)
     {
         if (!p)
             return;
-        ASSERT(fastMallocSize(p));
         ValueCheck<P>::checkConsistency(*p);
     }
 };
 #endif
 
 }
 
 #endif // ValueCheck_h