Sort names in JSObject::CollectOwnPropertyNames.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 99a8f59046793e78b22b85c70fb7d91f6faaf02c..ed2e0816c7ab2195e645ca0f3d1f48e64bef6e19 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2257,8 +2257,8 @@ class JSObject: public JSReceiver {
   // index. Returns the number of properties added.
   int GetOwnPropertyNames(FixedArray* storage, int index,
                           PropertyAttributes filter = NONE);
-  int CollectOwnPropertyNames(KeyAccumulator* keys,
-                              PropertyAttributes filter = NONE);
+  void CollectOwnPropertyNames(KeyAccumulator* keys,
+                               PropertyAttributes filter = NONE);
 
   // Returns the number of properties on this object filtering out properties
   // with the specified attributes (ignoring interceptors).
@@ -3400,8 +3400,9 @@ class Dictionary: public HashTable<Derived, Shape, Key> {
   // Returns the number of properties added.
   int CopyKeysTo(FixedArray* storage, int index, PropertyAttributes filter,
                  SortMode sort_mode);
-  // Collect the unsorted keys into the given KeyAccumulator.
-  int CollectKeysTo(KeyAccumulator* keys, PropertyAttributes filter);
+  // Collect the keys into the given KeyAccumulator, in ascending chronological
+  // order of property creation.
+  void CollectKeysTo(KeyAccumulator* keys, PropertyAttributes filter);
 
   // Copies enumerable keys to preallocated fixed array.
   void CopyEnumKeysTo(FixedArray* storage);