Replace uses of {un}setPendingActivity() in FetchBodyStream.

Source/modules/serviceworkers/FetchBodyStream.h

 // Copyright 2014 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.
 
 #ifndef FetchBodyStream_h
 #define FetchBodyStream_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/fileapi/FileReaderLoader.h"
 #include "core/fileapi/FileReaderLoaderClient.h"
 #include "platform/blob/BlobData.h"
 #include "platform/heap/Handle.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class ScriptState;
 
-// FIXME: Oilpan: when the implementation stops using
-// ActiveDOMObject::(un)setPendingActivity, derive from
-// RefCountedWillBeGarbageCollectedFinalized instead.
 class FetchBodyStream FINAL
-    : public RefCountedWillBeRefCountedGarbageCollected<FetchBodyStream>
+    : public RefCountedWillBeGarbageCollectedFinalized<FetchBodyStream>
     , public ScriptWrappable
     , public ActiveDOMObject
     , public FileReaderLoaderClient {
 public:
     enum ResponseType {
         ResponseAsArrayBuffer,
         ResponseAsBlob,
         ResponseAsFormData,
         ResponseAsJSON,
         ResponseAsText
     };
 
     static PassRefPtrWillBeRawPtr<FetchBodyStream> create(ExecutionContext*, PassRefPtr<BlobDataHandle>);
     ~FetchBodyStream() { }
 
     ScriptPromise asArrayBuffer(ScriptState*);
     ScriptPromise asBlob(ScriptState*);
     ScriptPromise asFormData(ScriptState*);
     ScriptPromise asJSON(ScriptState*);
     ScriptPromise asText(ScriptState*);
 
     // ActiveDOMObject override.
     virtual void stop() OVERRIDE;
+    virtual bool hasPendingActivity() const OVERRIDE;
 
     void trace(Visitor*) { }
 
 private:
     FetchBodyStream(ExecutionContext*, PassRefPtr<BlobDataHandle>);
     ScriptPromise readAsync(ScriptState*, ResponseType);
     void resolveJSON();
 
     // FileReaderLoaderClient functions.
     virtual void didStartLoading() OVERRIDE;
     virtual void didReceiveData() OVERRIDE;
     virtual void didFinishLoading() OVERRIDE;
     virtual void didFail(FileError::ErrorCode) OVERRIDE;
 
     RefPtr<BlobDataHandle> m_blobDataHandle;
     OwnPtr<FileReaderLoader> m_loader;
     bool m_hasRead;
     ResponseType m_responseType;
     RefPtr<ScriptPromiseResolver> m_resolver;
 };
 
 } // namespace WebCore
 
 #endif // FetchBodyStream_h