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

third_party/WebKit/LayoutTests/fast/forms/listbox-onchange-expected.txt

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-Results:
-1) Make sure onChange doesn't fire when clicking on an initially selected item
-2) Make sure onChange fires when deselecting an initially selected item
-onChange fired
-3) Make sure onChange fires when clicking
-onChange fired
-4) Make sure onChange doesn't fire when clicking again on the same item
-5) Make sure onChange fires when clicking on a new item
-onChange fired
-6) Make sure onChange fires when changing the selection with the keyboard
-onChange fired
-7) Make sure onChange doesn't fire when setting the select element's value from JS
-8) Make sure onChange doesn't fire when clicking on the already selected option
-9) Make sure onChange doesn't fire when setting an option's selected state from JS
-10) Make sure onChange doesn't fire when clicking on this option
-11) Make sure onChange fires when deselecting the last selected option with a mouse click
-onChange fired
-12) Make sure onChange doesn't fire when adding a new selected option
-13) Make sure onChange doesn't fire when clicking on it
-14) Make sure onChange fires when clicking on a previously selected option
-onChange fired
-15) Make sure onChange doesn't fire when removing a selected option
-16) Make sure onChange doesn't fire when clicking on the option that remains selected
-17) Make sure onChange fires when typing the name of an option
-onChange fired
-18) Make sure onChange doesn't fire when leaving the select