The second argument of add/removeEventListener should be an object, null, or undefined

third_party/WebKit/Source/bindings/core/v8/V8EventListenerHelper.h

Index: third_party/WebKit/Source/bindings/core/v8/V8EventListenerHelper.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8EventListenerHelper.h b/third_party/WebKit/Source/bindings/core/v8/V8EventListenerHelper.h
index e2df0f0e6fc9ec0e17b4465b7967d26e296e9657..7d579dc44acaf7d66d8861843b1725568b4dd596 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8EventListenerHelper.h
+++ b/third_party/WebKit/Source/bindings/core/v8/V8EventListenerHelper.h
@@ -31,6 +31,7 @@
 #ifndef V8EventListenerHelper_h
 #define V8EventListenerHelper_h
 
+#include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8EventListener.h"
 #include "core/CoreExport.h"
@@ -70,7 +71,8 @@ class V8EventListenerHelper {
   CORE_EXPORT static EventListener* getEventListener(ScriptState*,
                                                      v8::Local<v8::Value>,
                                                      bool isAttribute,
-                                                     ListenerLookupType);
+                                                     ListenerLookupType,
+                                                     ExceptionState&);
 
  private:
   static V8EventListener* findEventListener(