Make WebTaskRunner ThreadSafeRefCounted

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

Index: third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.cpp
diff --git a/third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.cpp b/third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.cpp
index f053a33e37d4afb757810137089f54b41c110043..d80833304e81fd3e5058522414a4c56f51fe1d9b 100644
--- a/third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.cpp
+++ b/third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.cpp
@@ -257,20 +257,20 @@ void ImageBitmapFactories::ImageBitmapLoader::scheduleAsyncImageBitmapDecoding(
       BackgroundTaskRunner::TaskSizeShortRunningTask;
   if (arrayBuffer->byteLength() >= longTaskByteLengthThreshold)
     taskSize = BackgroundTaskRunner::TaskSizeLongRunningTask;
-  WebTaskRunner* taskRunner =
+  RefPtr<WebTaskRunner> taskRunner =
       Platform::current()->currentThread()->getWebTaskRunner();
   BackgroundTaskRunner::postOnBackgroundThread(
       BLINK_FROM_HERE,
       crossThreadBind(
           &ImageBitmapFactories::ImageBitmapLoader::decodeImageOnDecoderThread,
-          wrapCrossThreadPersistent(this), crossThreadUnretained(taskRunner),
+          wrapCrossThreadPersistent(this), std::move(taskRunner),
           wrapCrossThreadPersistent(arrayBuffer), m_options.premultiplyAlpha(),
           m_options.colorSpaceConversion()),
       taskSize);
 }
 
 void ImageBitmapFactories::ImageBitmapLoader::decodeImageOnDecoderThread(
-    WebTaskRunner* taskRunner,
+    RefPtr<WebTaskRunner> taskRunner,
     DOMArrayBuffer* arrayBuffer,
     const String& premultiplyAlphaOption,
     const String& colorSpaceConversionOption) {