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

Source/core/loader/DocumentLoader.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 167 matching lines @@
         virtual void dataReceived(Resource*, const char* data, unsigned length) override final;
         virtual void notifyFinished(Resource*) override final;
 
         bool maybeLoadEmpty();
 
         bool isRedirectAfterPost(const ResourceRequest&, const ResourceResponse&);
 
         bool shouldContinueForResponse() const;
 
         RawPtrWillBeMember<LocalFrame> m_frame;
-        RefPtrWillBeMember<ResourceFetcher> m_fetcher;
+        PersistentWillBeMember<ResourceFetcher> m_fetcher;
 
         ResourcePtr<RawResource> m_mainResource;
 
         RefPtrWillBeMember<DocumentWriter> m_writer;
 
         // A reference to actual request used to create the data source.
         // The only part of this request that should change is the url, and
         // that only in the case of a same-document navigation.
         ResourceRequest m_originalRequest;
 
@@ skipping 24 matching lines @@
         PersistentWillBeMember<ApplicationCacheHost> m_applicationCacheHost;
 
         RefPtr<ContentSecurityPolicy> m_contentSecurityPolicy;
         ClientHintsPreferences m_clientHintsPreferences;
         InitialScrollState m_initialScrollState;
     };
 
 } // namespace blink
 
 #endif // DocumentLoader_h