Oilpan: Move the EventListener hierarchy to Oilpan's heap

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index c5e2c0f3557d6050334b91396e17eaa3f3c3ec42..9136c042f5b298657c53482e44684d4edbbbe211 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -271,9 +271,9 @@ UserGestureNotifier::~UserGestureNotifier()
 
 class EmptyEventListener final : public EventListener {
 public:
-    static PassRefPtr<EmptyEventListener> create()
+    static PassRefPtrWillBeRawPtr<EmptyEventListener> create()
     {
-        return adoptRef(new EmptyEventListener());
+        return adoptRefWillBeNoop(new EmptyEventListener());
     }
 
     bool operator==(const EventListener& other) override