Test for https://bugs.webkit.org/show_bug.cgi?id=32013.

For manual testing, focus a radio button in the first group and use the arrow keys. Changing the checked radio button should fire change events.

a b c

For manual testing, focus a radio button in the second group and use the arrow keys. Change events should still be dispatched but the checked radio should not change.

d e f

Test for https://code.google.com/p/chromium/issues/detail?id=556677.

For manual testing, focus a radio button in the first group and use the arrow keys. Changing the radio button should fire change events in the direction of left to right.