[Oilpan] Apply RefCountedGarbageCollectedEventTarget on AbstractWorker

Source/modules/serviceworkers/ServiceWorkerContainer.h

Index: Source/modules/serviceworkers/ServiceWorkerContainer.h
diff --git a/Source/modules/serviceworkers/ServiceWorkerContainer.h b/Source/modules/serviceworkers/ServiceWorkerContainer.h
index 6484728dc72c20ecb111d1ee9fe4ca4d7b34858e..0974d55d36d9a525514754cd84972c4b127e839c 100644
--- a/Source/modules/serviceworkers/ServiceWorkerContainer.h
+++ b/Source/modules/serviceworkers/ServiceWorkerContainer.h
@@ -43,8 +43,6 @@
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/serviceworker/WebServiceWorkerProviderClient.h"
 #include "wtf/Forward.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefPtr.h"
 
 namespace blink {
 
@@ -68,7 +66,7 @@ public:
 
     DECLARE_VIRTUAL_TRACE();
 
-    PassRefPtrWillBeRawPtr<ServiceWorker> controller() { return m_controller.get(); }
+    ServiceWorker* controller() { return m_controller; }
     ScriptPromise ready(ScriptState*);
     WebServiceWorkerProvider* provider() { return m_provider; }
 
@@ -95,7 +93,7 @@ private:
     ReadyProperty* createReadyProperty();
 
     WebServiceWorkerProvider* m_provider;
-    RefPtrWillBeMember<ServiceWorker> m_controller;
+    Member<ServiceWorker> m_controller;
     Member<ReadyProperty> m_ready;
 };