Move select/option/optgroup-related tests in fast/forms to fast/forms/select.

third_party/WebKit/LayoutTests/fast/forms/select/add-remove-option-modification-event.html

 <p>Test that SELECT is in correct state when handling a DOM modification event for option removing.</p>
 <form>
 <select ><option selected>1</option><option>2</option></select>
 <select multiple><option selected>1</option><option selected>2</option></select>
 <select multiple></select>
 </form>
 <div id=res></div>
 <script>
     if (window.testRunner)
         testRunner.dumpAsText();
@@ skipping 47 matching lines @@
         theSelect.remove(theSelect.options[0]);
 
         theSelect = document.forms[0].elements[2];
         theSelect.addEventListener("DOMNodeInserted", nodeInserted, true);
         theSelect.options.add(new Option("2", "2", false, false), 0);
 
     } catch (ex) {
         alert(ex);
     }
 </script>