Add test case for mouseleave events within window bounds

LayoutTests/fast/events/event-sender-mouseleave-expected.txt

Index: LayoutTests/fast/events/event-sender-mouseleave-expected.txt
diff --git a/LayoutTests/accessibility/aria-fallback-roles-expected.txt b/LayoutTests/fast/events/event-sender-mouseleave-expected.txt
similarity index 57%
copy from LayoutTests/accessibility/aria-fallback-roles-expected.txt
copy to LayoutTests/fast/events/event-sender-mouseleave-expected.txt
index 1c1166a8f60909033fad04d7140e8957fe789782..83f8547c27591b912ea8c2f6b29fdee9d2e861cb 100644
--- a/LayoutTests/accessibility/aria-fallback-roles-expected.txt
+++ b/LayoutTests/fast/events/event-sender-mouseleave-expected.txt
@@ -1,11 +1,8 @@
-test
-This tests that aria fallback roles work correctly.
-
-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
-
-
-Role should be: AXRole: AXCheckBox
+PASS hasMouseLeave is true
+PASS hasMouseOut is true
 PASS successfullyParsed is true
 
 TEST COMPLETE
+Test that a mouse leave event is triggered.
 
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".