Couple V8AbstractEventListener's lifetime to the V8 listeners lifetime

third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.h

Index: third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.h b/third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.h
index fdb454f67910e54419c7ef754ca6f7b89b9c4876..bff7771719226dfcae202a643b8caffb2c2eb6b3 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.h
+++ b/third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.h
@@ -105,20 +105,12 @@ public:
         return !m_listener.isEmpty();
     }
 
-    void clearListenerObject()
-    {
-        m_listener.clear();
-    }
+    void clearListenerObject();
 
     bool belongsToTheCurrentWorld() const final;
     v8::Isolate* isolate() const { return m_isolate; }
     DOMWrapperWorld& world() const { return *m_world; }
 
-    // Oilpan: promptly clear listener wrapper.
-    EAGERLY_FINALIZE();
-#if ENABLE(OILPAN)
-    DECLARE_EAGER_FINALIZATION_OPERATOR_NEW();
-#endif
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         EventListener::trace(visitor);
@@ -129,7 +121,7 @@ protected:
 
     virtual void prepareListenerObject(ExecutionContext*) { }
 
-    void setListenerObject(v8::Local<v8::Object>, ScriptState*);
+    void setListenerObject(v8::Local<v8::Object>);
 
     void invokeEventHandler(ScriptState*, Event*, v8::Local<v8::Value>);
 
@@ -147,9 +139,14 @@ private:
     virtual bool shouldPreventDefault(v8::Local<v8::Value> returnValue);
 
     static void setWeakCallback(const v8::WeakCallbackInfo<V8AbstractEventListener>&);
+    static void secondWeakCallback(const v8::WeakCallbackInfo<V8AbstractEventListener>&);
+
+#if ENABLE(OILPAN)
+    // Couples the lifetime of the V8AbstractEventListener to m_listener's
+    // lifetime.
+    SelfKeepAlive<V8AbstractEventListener> m_keepAlive;
+#endif
 
-    // The ScriptState the m_listener below was created in.
-    RefPtr<ScriptState> m_scriptStateForListener;
     ScopedPersistent<v8::Object> m_listener;
 
     // Indicates if this is an HTML type listener.