Make DOMWrapperWorld::current() return a reference instead of a pointer

Source/bindings/v8/V8AbstractEventListener.h

Index: Source/bindings/v8/V8AbstractEventListener.h
diff --git a/Source/bindings/v8/V8AbstractEventListener.h b/Source/bindings/v8/V8AbstractEventListener.h
index 37b1542ab045e8db6858a8f064aec35466ef51d3..ecae8f13b16c0ea1acd26013a661ac6c3c8aaa1d 100644
--- a/Source/bindings/v8/V8AbstractEventListener.h
+++ b/Source/bindings/v8/V8AbstractEventListener.h
@@ -109,11 +109,11 @@ namespace WebCore {
         }
 
         virtual bool belongsToTheCurrentWorld() const OVERRIDE FINAL;
-        virtual DOMWrapperWorld* world() const OVERRIDE FINAL { return m_world.get(); }
+        DOMWrapperWorld& world() const { return *m_world; }
         v8::Isolate* isolate() const { return m_isolate; }
 
     protected:
-        V8AbstractEventListener(bool isAttribute, DOMWrapperWorld*, v8::Isolate*);
+        V8AbstractEventListener(bool isAttribute, DOMWrapperWorld&, v8::Isolate*);
 
         virtual void prepareListenerObject(ExecutionContext*) { }