Add 'error' parameter to 'window.onerror' handlers.

Source/core/dom/ErrorEvent.h

Index: Source/core/dom/ErrorEvent.h
diff --git a/Source/core/dom/ErrorEvent.h b/Source/core/dom/ErrorEvent.h
index a28dcbef2a1e81300849935046f502bf0a8e94db..821554452fb4a24decb2d92844213b9222475257 100644
--- a/Source/core/dom/ErrorEvent.h
+++ b/Source/core/dom/ErrorEvent.h
@@ -59,6 +59,10 @@ public:
     {
         return adoptRef(new ErrorEvent(type, initializer));
     }
+    static PassRefPtr<ErrorEvent> createSanitizedError()
+    {
+        return adoptRef(new ErrorEvent("Script error.", String(), 0, 0));
+    }
     virtual ~ErrorEvent();
 
     const String& message() const { return m_message; }