[Oilpan] Apply RefCountedGarbageCollectedEventTarget on AbstractWorker

Source/core/workers/Worker.cpp

Index: Source/core/workers/Worker.cpp
diff --git a/Source/core/workers/Worker.cpp b/Source/core/workers/Worker.cpp
index 79b3190abe9cbd7792f2c398afe6d61e88a1199e..dad998af419a347bbab5c7d5ca7009d79e414e36 100644
--- a/Source/core/workers/Worker.cpp
+++ b/Source/core/workers/Worker.cpp
@@ -19,7 +19,7 @@ Worker::Worker(ExecutionContext* 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);
@@ -28,9 +28,9 @@ PassRefPtrWillBeRawPtr<Worker> Worker::create(ExecutionContext* context, const S
         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;
 }