Make LayoutTests ambivalent of of anonymous blocks

third_party/WebKit/LayoutTests/accessibility/presentation-owned-elements.html

 <script src="../resources/js-test.js"></script>
 <script src="../resources/accessibility-helper.js"></script>
 <div>These lists have a static text role because they have a presentation role.</div>
 <ul role="presentation">
     <li>Presentation Item 1</li>
     <li>Presentation Item 2</li>
 </ul>
 
 <div>The first list item has a listitem role even if ul has a presentation role because it has an explicit role.</div>
 <ul role="presentation">
@@ skipping 45 matching lines @@
 Button has a button role because it has an explicit role.</div>
 <menu type="context" role="presentation">
 <input type="checkbox" name="vehicle" value="Bike" disabled> I have a bike
 <input type="button" role="button" value="Click me" disabled>
 <input type="radio" name="gender" value="male" disabled> Male
 <input type="radio" name="gender" value="female" disabled> Female
 </menu>
 
 <div>The option A has a static text role because it has a presentation role and is disabled.<br>
 The option B has option role because it has an explicit role.</div>
-<select multiple role="presentation" disabled>
-  <option value="A" disabled>A</option>
-  <option value="B" disabled role="option">B</option>
-</select>
+<div role="group">
+  <select multiple role="presentation" disabled>
+    <option value="A" disabled>A</option>
+    <option value="B" disabled role="option">B</option>
+  </select>
+</div>
 
 <p>End of test</p>
 <p id="description"></p>
 <div id="console"></div>
 <script>
 description("This test make sure that presentation role is inherited to required owned elements.");
 
 if (window.testRunner)
     testRunner.dumpAsText();
 if (window.accessibilityController) {
     buildAccessibilityTree(accessibilityController.focusedElement, 0, 1);
 }
 </script>