Bug 1016184 - Part 3c: Fix test_focus_disabled.html. r=ehsan

Move the witness down so that touch caret won't cover other elements
when witness is focused().

dom/events/test/test_focus_disabled.html

@@ -14,10 +14,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=375008
 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=375008">Mozilla Bug 375008</a>
 <p id="display"></p>
 <div id="content">
-  <div>
-    <input id='witness'>
-  </div>
-
   <div id='not-focusable'>
     <!-- Disabled elements -->
     <button hidden disabled>foo</button>
@@ -52,6 +48,10 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=375008
     <option hidden>foo</option>
   </div>
 
+  <div>
+    <input id='witness'>
+  </div>
+
 </div>
 <pre id="test">
 <script type="application/javascript">