[API] remove (deprecated) hidden properties.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 21f7dc417de4e768886cc425599bdf05f5750b60..afdc7bb4cd397d69625ecdca09c295a668e0a6ae 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -2694,14 +2694,6 @@ void Heap::CreateInitialObjects() {
 #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)                                      \