[Oilpan] [Reland] Migrate classes under core/fetch to Oilpan heap

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 32 matching lines @@
 class Document;
 class DocumentLoader;
 class LocalFrame;
 class ResourceError;
 class ResourceLoader;
 class ResourceResponse;
 class ResourceRequest;
 
 class CORE_EXPORT FrameFetchContext final : public FetchContext {
 public:
-    static PassRefPtrWillBeRawPtr<ResourceFetcher> createContextAndFetcher(DocumentLoader* loader)
+    static ResourceFetcher* createContextAndFetcher(DocumentLoader* loader)
     {
-        return ResourceFetcher::create(adoptPtrWillBeNoop(new FrameFetchContext(loader)));
+        return ResourceFetcher::create(new FrameFetchContext(loader));
     }
 
     static void provideDocumentToContext(FetchContext& context, Document* document)
     {
         ASSERT(document);
         RELEASE_ASSERT(context.isLiveContext());
         static_cast<FrameFetchContext&>(context).m_document = document;
     }
 
     ~FrameFetchContext();
@@ skipping 56 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.
     RawPtrWillBeWeakMember<Document> m_document;
     DocumentLoader* m_documentLoader;
 };
 
 }
 
 #endif