Move files in wtf/ to platform/wtf/ (Part 5).

third_party/WebKit/Source/wtf/StdLibExtras.h

 /*
  * Copyright (C) 2008 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 245 matching lines @@
 char (&ArrayLengthHelperFunction(T (&)[Size]))[Size];
 // GCC needs some help to deduce a 0 length array.
 #if COMPILER(GCC)
 template <typename T>
 char (&ArrayLengthHelperFunction(T (&)[0]))[0];
 #endif
 #define WTF_ARRAY_LENGTH(array) sizeof(::WTF::ArrayLengthHelperFunction(array))
 
 }  // namespace WTF
 
-// This version of placement new omits a 0 check.
-enum NotNullTag { NotNull };
-inline void* operator new(size_t, NotNullTag, void* location) {
-  DCHECK(location);
-  return location;
-}
-
 using WTF::bitwiseCast;
 using WTF::safeCast;
 
 #endif  // WTF_StdLibExtras_h