Revert of Throw TypeError when addEventListener or removeEventListener are called

Source/core/events/EventTarget.h

Index: Source/core/events/EventTarget.h
diff --git a/Source/core/events/EventTarget.h b/Source/core/events/EventTarget.h
index 4c3f392627060454c26c8d8c040aaa60afacad65..2e86b3c77db0cb44c1142814ad9ff84bbdf0ef81 100644
--- a/Source/core/events/EventTarget.h
+++ b/Source/core/events/EventTarget.h
@@ -86,9 +86,14 @@
     virtual LocalDOMWindow* toDOMWindow();
     virtual MessagePort* toMessagePort();
 
-    // FIXME: default values should be specified in IDL, not C++
-    // http://crbug.com/258153
+    // FIXME: first 2 args to addEventListener and removeEventListener should
+    // be required (per spec), but throwing TypeError breaks legacy content.
+    // http://crbug.com/353484
+    bool addEventListener() { return false; }
+    bool addEventListener(const AtomicString& eventType) { return false; }
     virtual bool addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture = false);
+    bool removeEventListener() { return false; }
+    bool removeEventListener(const AtomicString& eventType) { return false; }
     virtual bool removeEventListener(const AtomicString& eventType, EventListener*, bool useCapture = false);
     virtual void removeAllEventListeners();
     virtual bool dispatchEvent(PassRefPtrWillBeRawPtr<Event>);