[API] remove (deprecated) hidden properties.

src/heap/heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/scopeinfo.h"
 #include "src/base/bits.h"
@@ skipping 2676 matching lines @@
   {                                                                    \
     Handle<String> name##d = factory->NewStringFromStaticChars(#name); \
     Handle<Symbol> symbol(isolate()->factory()->NewPrivateSymbol());   \
     symbol->set_name(*name##d);                                        \
     roots_[k##name##RootIndex] = *symbol;                              \
   }
     PRIVATE_SYMBOL_LIST(SYMBOL_INIT)
 #undef SYMBOL_INIT
   }
 
-  // The {hidden_properties_symbol} is special because it is the only name with
-  // hash code zero. This ensures that it will always be the first entry as
-  // sorted by hash code in descriptor arrays. It is used to identify the hidden
-  // properties in JSObjects.
-  // kIsNotArrayIndexMask is a computed hash with value zero.
-  Symbol::cast(roots_[khidden_properties_symbolRootIndex])
-      ->set_hash_field(Name::kIsNotArrayIndexMask);
-
   {
     HandleScope scope(isolate());
 #define SYMBOL_INIT(name, description)                                      \
   Handle<Symbol> name = factory->NewSymbol();                               \
   Handle<String> name##d = factory->NewStringFromStaticChars(#description); \
   name->set_name(*name##d);                                                 \
   roots_[k##name##RootIndex] = *name;
     PUBLIC_SYMBOL_LIST(SYMBOL_INIT)
 #undef SYMBOL_INIT
 
@@ skipping 3640 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8