Fix a bug in Object.defineProperty.

src/handles.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 152 matching lines @@
 
 // ----------------------------------------------------------------------------
 // Handle operations.
 // They might invoke garbage collection. The result is an handle to
 // an object of expected type, or the handle is an error if running out
 // of space or encountering an internal error.
 
 void NormalizeProperties(Handle<JSObject> object,
                          PropertyNormalizationMode mode,
                          int expected_additional_properties);
-void NormalizeElements(Handle<JSObject> object);
+Handle<NumberDictionary> NormalizeElements(Handle<JSObject> object);
 void TransformToFastProperties(Handle<JSObject> object,
                                int unused_property_fields);
 MUST_USE_RESULT Handle<NumberDictionary> NumberDictionarySet(
     Handle<NumberDictionary> dictionary,
     uint32_t index,
     Handle<Object> value,
     PropertyDetails details);
 
 // Flattens a string.
 void FlattenString(Handle<String> str);
@@ skipping 186 matching lines @@
   inline NoHandleAllocation();
   inline ~NoHandleAllocation();
  private:
   int level_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HANDLES_H_