HTMLOptionsCollection remove() argument should be long, not unsigned long

LayoutTests/fast/js/select-options-remove-expected.txt

 This test checks the behavior of the remove() method on the select.options object.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
 1.1 Remove (object) from empty Options
 PASS select1.options.remove(value) is undefined
 PASS select1.options.length is 0
 PASS select1.selectedIndex is -1
 
@@ skipping 166 matching lines @@
 PASS select2.options.remove(1) is undefined
 PASS select2.options.length is 3
 PASS select2.selectedIndex is 1
 PASS select2.options[1].value is 'O'
 
 2.17 Detach select element
 PASS select2.parentNode is not null
 PASS select2.remove() is undefined
 PASS select2.parentNode is null
 
+2.18 Remove index -2147483649 from non-empty Options
+PASS select2.options.remove(-2147483649) is undefined
+
+2.19 Remove index -2147483648 from non-empty Options
+PASS select2.options.remove(-2147483648) is undefined
+
+2.20 Remove index -2147483647 from non-empty Options
+PASS select2.options.remove(-2147483647) is undefined
+
+2.21 Remove index 2147483649 from non-empty Options
+PASS select2.options.remove(2147483649) is undefined
+
+2.22 Remove index 2147483648 from non-empty Options
+PASS select2.options.remove(2147483648) is undefined
+
+2.23 Remove index 2147483647 from non-empty Options
+PASS select2.options.remove(2147483647) is undefined
+
 PASS successfullyParsed is true
 
 TEST COMPLETE