Remove do-nothing trace traits on primitive types

Source/heap/Visitor.cpp

 /*
  * Copyright (C) 2014 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 39 matching lines @@
         Type* object = const_cast<Type*>(payload);                           \
         Address addr = pageHeaderAddress(reinterpret_cast<Address>(object)); \
         BaseHeapPage* page = reinterpret_cast<BaseHeapPage*>(addr);          \
         ASSERT(page->gcInfo() == gcInfo);                                    \
     }
 
 FOR_EACH_TYPED_HEAP(DEFINE_VISITOR_CHECK_MARKER)
 #undef DEFINE_VISITOR_CHECK_MARKER
 #endif
 
-#define DEFINE_DO_NOTHING_TRAIT(type)                  \
-const GCInfo GCInfoTrait<type>::info = {               \
-    doNothingTrace,                                    \
-    0, /* no finalizer method */                       \
-    false                                              \
-};
-
-ITERATE_DO_NOTHING_TYPES(DEFINE_DO_NOTHING_TRAIT)
-
 }