Revert of Throw TypeError when addEventListener or removeEventListener are called

Source/core/events/EventTarget.idl

Index: Source/core/events/EventTarget.idl
diff --git a/Source/core/events/EventTarget.idl b/Source/core/events/EventTarget.idl
index 08329aa268ad18a559963b0dbfde4d48b5b92fb2..69a4bc18d7b6e8986ae9c3dbe76371cd5ae3ba73 100644
--- a/Source/core/events/EventTarget.idl
+++ b/Source/core/events/EventTarget.idl
@@ -18,23 +18,17 @@
  * Boston, MA 02110-1301, USA.
  */
 
-// http://dom.spec.whatwg.org/#interface-eventtarget
-
 [
-    // FIXME: should use [CheckSecurity=Frame] http://crbug.com/383699
-    // CheckSecurity=Frame,
     Custom=ToV8,
     WillBeGarbageCollected,
 ] interface EventTarget {
-    void addEventListener([TreatNullAs=NullString] DOMString type,
-                          EventListener? listener,
-                          // FIXME: should be useCapture = false
-                          // http://crbug.com/258153
+    // FIXME: first 2 args should be required, but throwing TypeError breaks
+    // legacy content.  http://crbug.com/353484
+    void addEventListener([TreatNullAs=NullString] optional DOMString type,
+                          optional EventListener listener,
                           optional boolean useCapture);
-    void removeEventListener([TreatNullAs=NullString] DOMString type,
-                             EventListener? listener,
-                             // FIXME: should be useCapture = false
-                             // http://crbug.com/258153
+    void removeEventListener([TreatNullAs=NullString] optional DOMString type,
+                             optional EventListener listener,
                              optional boolean useCapture);
     [RaisesException] boolean dispatchEvent(Event event);
 };