Reland of [keys] Simplify KeyAccumulator

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 9d2a12c3d971dba08122d6e52657a8ea25538d59..7d7d233e6c2e0b0938dae7fbe1af041ed6ceaee4 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1975,17 +1975,8 @@ class JSReceiver: public HeapObject {
       Handle<JSReceiver> object);
 
   // ES6 [[OwnPropertyKeys]] (modulo return type)
-  MUST_USE_RESULT static MaybeHandle<FixedArray> OwnPropertyKeys(
-      Handle<JSReceiver> object) {
-    return GetKeys(object, OWN_ONLY, ALL_PROPERTIES, CONVERT_TO_STRING);
-  }
-
-  // Computes the enumerable keys for a JSObject. Used for implementing
-  // "for (n in object) { }".
-  MUST_USE_RESULT static MaybeHandle<FixedArray> GetKeys(
-      Handle<JSReceiver> object, KeyCollectionType type, PropertyFilter filter,
-      GetKeysConversion keys_conversion = KEEP_NUMBERS,
-      bool filter_proxy_keys_ = true);
+  MUST_USE_RESULT static inline MaybeHandle<FixedArray> OwnPropertyKeys(
+      Handle<JSReceiver> object);
 
   MUST_USE_RESULT static MaybeHandle<FixedArray> GetOwnValues(
       Handle<JSReceiver> object, PropertyFilter filter);
@@ -3980,6 +3971,8 @@ class OrderedHashSet: public OrderedHashTable<
 
   static Handle<OrderedHashSet> Add(Handle<OrderedHashSet> table,
                                     Handle<Object> value);
+  static Handle<FixedArray> ConvertToKeysArray(Handle<OrderedHashSet> table,
+                                               GetKeysConversion convert);
 };