Fix to Handle downkey event on last and first radio button of a radio button list

LayoutTests/fast/forms/radio/radio-checked-LastorFirst-then-DownorUp-keyDown-expected.txt

Index: LayoutTests/fast/forms/radio/radio-checked-LastorFirst-then-DownorUp-keyDown-expected.txt
diff --git a/LayoutTests/fast/forms/radio/radio-checked-LastorFirst-then-DownorUp-keyDown-expected.txt b/LayoutTests/fast/forms/radio/radio-checked-LastorFirst-then-DownorUp-keyDown-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a3f41118e5b4a76fc0cefd909ead65a0e10ea460
--- /dev/null
+++ b/LayoutTests/fast/forms/radio/radio-checked-LastorFirst-then-DownorUp-keyDown-expected.txt
@@ -0,0 +1,24 @@
+Tests after pressing last radio button in the list, on pressing downkey it selects back first radio button
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS document.getElementById("cherry").checked is true
+PASS document.getElementById("apple").checked is true
+PASS document.getElementById("cherry").checked is true
+PASS document.getElementById("cucumber").checked is true
+PASS document.getElementById("tomato").checked is true
+PASS document.getElementById("cucumber").checked is true
+PASS document.getElementById("pumpkin").checked is true
+PASS document.getElementById("pumpkin").checked is true
+PASS document.getElementById("pumpkin").checked is true
+PASS successfullyParsed is true
+
+TEST COMPLETE
+
+
+
+
+
+
+