Remove Overlay Scrollbar if not scrollable along the axis

LayoutTests/fast/forms/select/listbox-overlay-scrollbar.html

Index: LayoutTests/fast/forms/select/listbox-overlay-scrollbar.html
diff --git a/LayoutTests/fast/forms/select/listbox-overlay-scrollbar.html b/LayoutTests/fast/forms/select/listbox-overlay-scrollbar.html
index f34a20fb30525fb4a1d31bea138b57ba30e78366..388ed39dbc85cb77da74e48472f1c92acc3d28df 100644
--- a/LayoutTests/fast/forms/select/listbox-overlay-scrollbar.html
+++ b/LayoutTests/fast/forms/select/listbox-overlay-scrollbar.html
@@ -12,6 +12,8 @@ html, body {
     height: 100px;
     background-color: lime;
     display: block;
+    font-family: "Arial";
+    font-size : 12pt;
 }
 </style>
 <script>
@@ -27,10 +29,22 @@ if (window.internals) {
 should have a scrollbar on the left.</p>
 
 <div>
-<select multiple class="sel"></select>
+<select multiple class="sel" size=5">
+<option>foo1</option>

[enne (OOO), 2014/10/07 18:57:22]

Can you tell me why you needed to add all these options? Does this test have
overflow?  (If so, is there a test that verifies that not having overflow means
no scrollbars?)

[MuVen, 2014/10/07 23:45:42]

This test is for to check overlay scrollbar with in the list box.
Without adding these option tag i was not able to pass this test 
in the mac platform(as i see mac displays the scrollbar upon
some content with in the listbox).There is not test for not having
scrollbars.

+<option>foo2</option>
+<option>foo3</option>
+<option>foo4</option>
+<option>foo5</option>
+</select>
 </div>
 <div>
-<select multiple dir="rtl" class="sel"></select>
+<select multiple dir="rtl" class="sel" size=5">
+<option>foo1</option>
+<option>foo2</option>
+<option>foo3</option>
+<option>foo4</option>
+<option>foo5</option>
+</select>
 </div>
 </body>
 </html>