Add a standard placement new operator to WTF_USE_ALLOCATOR.

third_party/WebKit/Source/wtf/allocator/PartitionAllocator.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 137 matching lines @@
         return Allocator::template malloc<void*, ClassName>(size, WTF_HEAP_PROFILER_TYPE_NAME(ClassName)); \
     } \
     void operator delete(void* p) { Allocator::free(p); } \
     void* operator new[](size_t size) { return Allocator::template newArray<ClassName>(size); } \
     void operator delete[](void* p) { Allocator::deleteArray(p); } \
     void* operator new(size_t, NotNullTag, void* location) \
     { \
         ASSERT(location); \
         return location; \
     } \
+    void* operator new(size_t, void* location) { return location; } \
 private: \
 typedef int __thisIsHereToForceASemicolonAfterThisMacro
 
 using WTF::PartitionAllocator;
 
 #endif // WTF_PartitionAllocator_h