Make WebTaskRunner ThreadSafeRefCounted

third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.h

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 111 matching lines @@
 
    private:
     ImageBitmapLoader(ImageBitmapFactories&,
                       Optional<IntRect> cropRect,
                       ScriptState*,
                       const ImageBitmapOptions&);
 
     void rejectPromise();
 
     void scheduleAsyncImageBitmapDecoding(DOMArrayBuffer*);
-    void decodeImageOnDecoderThread(WebTaskRunner*,
+    void decodeImageOnDecoderThread(RefPtr<WebTaskRunner>,
                                     DOMArrayBuffer*,
                                     const String& premultiplyAlphaOption,
                                     const String& colorSpaceConversionOption);
     void resolvePromiseOnOriginalThread(sk_sp<SkImage>);
 
     // FileReaderLoaderClient
     void didStartLoading() override {}
     void didReceiveData() override {}
     void didFinishLoading() override;
     void didFail(FileError::ErrorCode) override;
@@ skipping 12 matching lines @@
 
   void addLoader(ImageBitmapLoader*);
   void didFinishLoading(ImageBitmapLoader*);
 
   HeapHashSet<Member<ImageBitmapLoader>> m_pendingLoaders;
 };
 
 }  // namespace blink
 
 #endif  // ImageBitmapFactories_h