Remove unnecessary CanvasAsyncBlobCreator keep alive protection.

third_party/WebKit/Source/core/html/canvas/CanvasAsyncBlobCreator.h

 // 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 "core/CoreExport.h"
 #include "core/dom/DOMTypedArray.h"
 #include "core/fileapi/BlobCallback.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/heap/Handle.h"
 #include "wtf/OwnPtr.h"
-#include "wtf/PassOwnPtr.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class PNGImageEncoderState;
 class JPEGImageEncoderState;
 
 class CORE_EXPORT CanvasAsyncBlobCreator : public GarbageCollectedFinalized<CanvasAsyncBlobCreator> {
 public:
     static CanvasAsyncBlobCreator* create(DOMUint8ClampedArray* unpremultipliedRGBAImageData, const String& mimeType, const IntSize&, BlobCallback*);
     void scheduleAsyncBlobCreation(bool canUseIdlePeriodScheduling, double quality = 0.0);
     virtual ~CanvasAsyncBlobCreator();
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         visitor->trace(m_data);
     }
 
 private:
     CanvasAsyncBlobCreator(DOMUint8ClampedArray* data, const String& mimeType, const IntSize&, BlobCallback*);
-    void scheduleCreateBlobAndCallOnMainThread();
-    void scheduleCreateNullptrAndCallOnMainThread();
 
     OwnPtr<PNGImageEncoderState> m_pngEncoderState;
     OwnPtr<JPEGImageEncoderState> m_jpegEncoderState;
     Member<DOMUint8ClampedArray> m_data;
     OwnPtr<Vector<unsigned char>> m_encodedImage;
     int m_numRowsCompleted;
 
     const IntSize m_size;
     size_t m_pixelRowStride;
     const String m_mimeType;
     CrossThreadPersistent<BlobCallback> m_callback;
 
-    SelfKeepAlive<CanvasAsyncBlobCreator> m_keepAlive;
-    void clearSelfReference();
-
     void initiatePngEncoding(double deadlineSeconds);
     void scheduleIdleEncodeRowsPng();
     void idleEncodeRowsPng(double deadlineSeconds);
 
     void initiateJpegEncoding(const double& quality);
 
     void createBlobAndCall();
 
     void encodeImageOnEncoderThread(double quality);
 };
 
 } // namespace blink