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

third_party/WebKit/LayoutTests/fast/forms/select/select-baseline.html

 <style>
 .styledControl {
     background-color: lightblue;
     color: darkblue;
 }
 </style>
 This tests that empty select controls and buttons have the correct baseline.<br>
 <select>
     <option>
 </select>
 test
 <select>
     <option>test
 </select>
 <select class="styledControl">
     <option>
 </select>
 test
 <select class="styledControl">
     <option>test
 </select>
 <button></button>
 <button>test</button>
 <button class="styledControl"></button>
 <button class="styledControl">test</button>