[Oilpan] Apply RefCountedGarbageCollectedEventTarget on AbstractWorker

Source/core/workers/Worker.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/workers/Worker.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/UseCounter.h"
 #include "core/workers/WorkerGlobalScopeProxy.h"
 #include "core/workers/WorkerGlobalScopeProxyProvider.h"
 
 namespace blink {
 
 Worker::Worker(ExecutionContext* context)
     : InProcessWorkerBase(context)
 {
 }
 
-PassRefPtrWillBeRawPtr<Worker> Worker::create(ExecutionContext* context, const String& url, ExceptionState& exceptionState)
+Worker* Worker::create(ExecutionContext* context, const String& url, ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     Document* document = toDocument(context);
     UseCounter::count(context, UseCounter::WorkerStart);
     if (!document->page()) {
         exceptionState.throwDOMException(InvalidAccessError, "The context provided is invalid.");
         return nullptr;
     }
-    RefPtrWillBeRawPtr<Worker> worker = adoptRefWillBeNoop(new Worker(context));
+    Worker* worker = new Worker(context);
     if (worker->initialize(context, url, exceptionState))
-        return worker.release();
+        return worker;
     return nullptr;
 }
 
 Worker::~Worker()
 {
     ASSERT(isMainThread());
 }
 
 const AtomicString& Worker::interfaceName() const
 {
     return EventTargetNames::Worker;
 }
 
 WorkerGlobalScopeProxy* Worker::createWorkerGlobalScopeProxy(ExecutionContext* context)
 {
     Document* document = toDocument(context);
     WorkerGlobalScopeProxyProvider* proxyProvider = WorkerGlobalScopeProxyProvider::from(*document->page());
     ASSERT(proxyProvider);
     return proxyProvider->createWorkerGlobalScopeProxy(this);
 }
 
 } // namespace blink