Support size<4 rendering of listbox <select>.

LayoutTests/fast/forms/select/listbox-appearance-basic.html

Index: LayoutTests/fast/forms/select/listbox-appearance-basic.html
diff --git a/LayoutTests/fast/forms/select/listbox-appearance-basic.html b/LayoutTests/fast/forms/select/listbox-appearance-basic.html
index 732064e701258be18ef1c5b8f1722de530624658..da226f1f105209d9b4ecb4c7bc22879db1db1db1 100644
--- a/LayoutTests/fast/forms/select/listbox-appearance-basic.html
+++ b/LayoutTests/fast/forms/select/listbox-appearance-basic.html
@@ -18,6 +18,10 @@ document.querySelectorAll('select')[1].focus();
 </script>
 <select multiple><option selected>foo</option><option selected disabled>bar</option></select>
 <select multiple disabled><option selected>foo</option><option>bar</option><optgroup><option selected>baz</option></optgroup></select>
+
+<select multiple size=1><option>foo1</option><option>foo2</option><option>foo3</option><option>foo4</option></select>
+<select multiple size=2><option>foo1</option><option>foo2</option><option>foo3</option><option>foo4</option></select>
+<select multiple size=3><option>foo1</option><option>foo2</option><option>foo3</option><option>foo4</option></select>
 <br>
 
 <!-- border -->