Remove the global event property.

sky/engine/bindings/core/v8/V8ErrorHandler.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 35 matching lines @@
     {
         return adoptRef(new V8ErrorHandler(listener, scriptState));
     }
 
     static void storeExceptionOnErrorEventWrapper(ErrorEvent*, v8::Handle<v8::Value>, v8::Handle<v8::Object> creationContext, v8::Isolate*);
 
 private:
     V8ErrorHandler(v8::Local<v8::Object> listener, ScriptState*);
 
     virtual v8::Local<v8::Value> callListenerFunction(v8::Handle<v8::Value> jsEvent, Event*) override;
-    virtual bool shouldPreventDefault(v8::Local<v8::Value> returnValue) override;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_BINDINGS_CORE_V8_V8ERRORHANDLER_H_