Fix for crash occuring when spatial navigation is enabled

LayoutTests/fast/spatial-navigation/snav-date-expected.txt

Index: LayoutTests/fast/spatial-navigation/snav-date-expected.txt
diff --git a/LayoutTests/fast/spatial-navigation/snav-date-expected.txt b/LayoutTests/fast/spatial-navigation/snav-date-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3d16777f2dd0c61e29a92d7c07722a85060120ce
--- /dev/null
+++ b/LayoutTests/fast/spatial-navigation/snav-date-expected.txt
@@ -0,0 +1,19 @@
+This test ensures the correctness of Spatial Navigation (SNav) algorithm over date input element (having shadow DOM).
+* Navigation steps:
+1) Loads this page, focus goes to "start" automatically.
+2) Focus moves away from input box, left and right to neighbor nodes and back.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Left		Right
+PASS gFocusedDocument.activeElement.getAttribute("id") is "left"
+PASS gFocusedDocument.activeElement.getAttribute("id") is "start"
+PASS gFocusedDocument.activeElement.getAttribute("id") is "start"
+PASS gFocusedDocument.activeElement.getAttribute("id") is "start"
+PASS gFocusedDocument.activeElement.getAttribute("id") is "right"
+PASS gFocusedDocument.activeElement.getAttribute("id") is "start"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+