Make WebTaskRunner ThreadSafeRefCounted

third_party/WebKit/Source/core/loader/FrameFetchContext.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 135 matching lines @@
 
   MHTMLArchive* archive() const override;
 
   ResourceLoadPriority modifyPriorityForExperiments(
       ResourceLoadPriority) override;
 
   void countClientHintsDPR() override;
   void countClientHintsResourceWidth() override;
   void countClientHintsViewportWidth() override;
 
-  WebTaskRunner* loadingTaskRunner() const override;
+  RefPtr<WebTaskRunner> loadingTaskRunner() const override;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   FrameFetchContext(DocumentLoader*, Document*);
   inline DocumentLoader* masterDocumentLoader() const;
 
   LocalFrame* frameOfImportsController() const;
   LocalFrame* frame() const;
   void printAccessDeniedMessage(const KURL&) const;
@@ skipping 18 matching lines @@
   // FIXME: Oilpan: Ideally this should just be a traced Member but that will
   // currently leak because ComputedStyle and its data are not on the heap.
   // See crbug.com/383860 for details.
   WeakMember<Document> m_document;
   Member<DocumentLoader> m_documentLoader;
 };
 
 }  // namespace blink
 
 #endif