Drop [LegacyInterfaceTypeChecking] for EventTarget's dispatchEvent()

third_party/WebKit/LayoutTests/fast/dom/DOMException/resources/dispatch-event-exception.js

-description("Tests the properties of the exception thrown by dispatchEvent.")
+description("Tests that dispatchEvent's argument is required to be an Event.")
 
-var e;
-try {
-    document.dispatchEvent(null);
-    // raises a InvalidStateError
-} catch (err) {
-    e = err;
-}
-
-shouldBeEqualToString("e.toString()", "InvalidStateError: Failed to execute 'dispatchEvent' on 'EventTarget': The event provided is null.");
-shouldBeEqualToString("Object.prototype.toString.call(e)", "[object DOMException]");
-shouldBeEqualToString("Object.prototype.toString.call(e.__proto__)", "[object DOMExceptionPrototype]");
-shouldBeEqualToString("e.constructor.toString()", "function DOMException() { [native code] }");
-shouldBe("e.constructor", "window.DOMException");
-
+shouldThrow("document.dispatchEvent(null)");
+shouldThrow("document.dispatchEvent(document)");