[cleanup] Introduce HasEnumerableElements() helper

src/objects.h

 // 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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 2252 matching lines @@
   int NumberOfOwnProperties(PropertyFilter filter = ALL_PROPERTIES);
   // Fill in details for properties into storage starting at the specified
   // index. Returns the number of properties added.
   int GetOwnPropertyNames(FixedArray* storage, int index,
                           PropertyFilter filter = ALL_PROPERTIES);
   void CollectOwnPropertyNames(KeyAccumulator* keys,
                                PropertyFilter filter = ALL_PROPERTIES);
 
   // Returns the number of properties on this object filtering out properties
   // with the specified attributes (ignoring interceptors).
+  // TODO(jkummerow): Deprecated, only used by Object.observe.
   int NumberOfOwnElements(PropertyFilter filter);
-  // Returns the number of enumerable elements (ignoring interceptors).
-  int NumberOfEnumElements();
   // Returns the number of elements on this object filtering out elements
   // with the specified attributes (ignoring interceptors).
+  // TODO(jkummerow): Deprecated, only used by Object.observe.
   int GetOwnElementKeys(FixedArray* storage, PropertyFilter filter);
+
   static void CollectOwnElementKeys(Handle<JSObject> object,
                                     KeyAccumulator* keys,
                                     PropertyFilter filter);
 
   static Handle<FixedArray> GetEnumPropertyKeys(Handle<JSObject> object,
                                                 bool cache_result);
 
   // Returns a new map with all transitions dropped from the object's current
   // map and the ElementsKind set.
   static Handle<Map> GetElementsTransitionMap(Handle<JSObject> object,
@@ skipping 8394 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_