[runtime] Remove obsolete %GetPropertyNames runtime entry.

test/mjsunit/unbox-double-arrays.js

 // Copyright 2012 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 471 matching lines @@
 }
 
 test_for_in();
 test_for_in();
 test_for_in();
 %OptimizeFunctionOnNextCall(test_for_in);
 test_for_in();
 test_for_in();
 test_for_in();
 
-function test_get_property_names() {
-  names = %GetPropertyNames(large_array3);
-  property_name_count = 0;
-  for (x in names) { property_name_count++; };
-  assertEquals(26, property_name_count);
-}
-
-test_get_property_names();
-test_get_property_names();
-test_get_property_names();
-
 // Test elements getters.
 assertEquals(expected_array_value(10), large_array3[10]);
 assertEquals(expected_array_value(-NaN), large_array3[2]);
 large_array3.__defineGetter__("2", function(){
     return expected_array_value(10);
 });
 
 function test_getter() {
   assertEquals(expected_array_value(10), large_array3[10]);
   assertEquals(expected_array_value(10), large_array3[2]);
@@ skipping 27 matching lines @@
   assertEquals(expected_array_value(2), large_array4[2]);
 }
 
 test_setter();
 test_setter();
 test_setter();
 %OptimizeFunctionOnNextCall(test_setter);
 test_setter();
 test_setter();
 test_setter();