Have FrameFetchContext check for frame detached status more often.

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 40 matching lines @@
 public:
     static PassRefPtrWillBeRawPtr<ResourceFetcher> createContextAndFetcher(DocumentLoader* loader)
     {
         return ResourceFetcher::create(adoptPtrWillBeNoop(new FrameFetchContext(loader)));
     }
 
     ~FrameFetchContext();
 
     LocalFrame* frame() const override; // Can be null
     Document* document() const override { return m_document; } // Can be null
-    void setDocument(RawPtr<Document> document) { m_document = document; }
+    void setDocument(Document* document) { m_document = document; }
     DocumentLoader* documentLoader() const override { return m_documentLoader; }
     void clearDocumentLoader() { m_documentLoader = nullptr; }
 
     virtual void reportLocalLoadFailed(const KURL&) override;
     virtual void addAdditionalRequestHeaders(Document*, ResourceRequest&, FetchResourceType) override;
     virtual void setFirstPartyForCookies(ResourceRequest&) override;
     virtual CachePolicy cachePolicy(Document*) const override;
     virtual void dispatchDidChangeResourcePriority(unsigned long identifier, ResourceLoadPriority, int intraPriorityValue);
     virtual void dispatchWillSendRequest(DocumentLoader*, unsigned long identifier, ResourceRequest&, const ResourceResponse& redirectResponse, const FetchInitiatorInfo& = FetchInitiatorInfo()) override;
     virtual void dispatchDidLoadResourceFromMemoryCache(const ResourceRequest&, const ResourceResponse&) override;
@@ skipping 13 matching lines @@
     // FIXME: Oilpan: Ideally this should just be a traced Member but that will
     // currently leak because LayoutStyle and its data are not on the heap.
     // See crbug.com/383860 for details.
     RawPtrWillBeWeakMember<Document> m_document;
     DocumentLoader* m_documentLoader;
 };
 
 }
 
 #endif