Remove resource type-specific fetching logic from ResourceFetcher

Source/core/fetch/ScriptResource.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
@@ skipping 14 matching lines @@
 
 #ifndef ScriptResource_h
 #define ScriptResource_h
 
 #include "core/CoreExport.h"
 #include "core/fetch/ResourceClient.h"
 #include "core/fetch/TextResource.h"
 
 namespace blink {
 
+class FetchRequest;
 class ScriptResource;
 
 class CORE_EXPORT ScriptResourceClient : public ResourceClient {
 public:
     virtual ~ScriptResourceClient() { }
     static ResourceClientType expectedType() { return ScriptType; }
     virtual ResourceClientType resourceClientType() const override final { return expectedType(); }
 
     virtual void notifyAppendData(ScriptResource* resource) { }
 };
 
 class CORE_EXPORT ScriptResource final : public TextResource {
 public:
     typedef ScriptResourceClient ClientType;
-    static PassOwnPtrWillBeRawPtr<ScriptResource> create(const ResourceRequest& request, const String& charset)
-    {
-        return adoptPtrWillBeNoop(new ScriptResource(request, charset));
-    }
+    static ResourcePtr<ScriptResource> fetch(FetchRequest&, ResourceFetcher*);
+
+    // Public for testing
+    ScriptResource(const ResourceRequest&, const String& charset);
 
     virtual ~ScriptResource();
 
     virtual void didAddClient(ResourceClient*) override;
     virtual void appendData(const char*, unsigned) override;
 
     const String& script();
 
     AtomicString mimeType() const;
 
     bool mimeTypeAllowedByNosniff() const;
 
 private:
-    ScriptResource(const ResourceRequest&, const String& charset);
+    class ScriptResourceFactory : public ResourceFactory {
+    public:
+        ScriptResourceFactory()
+            : ResourceFactory(Resource::Script) { }
+
+        Resource* create(const ResourceRequest& request, const String& charset) const override
+        {
+            return new ScriptResource(request, charset);
+        }
+    };
 
     AtomicString m_script;
 };
 
 DEFINE_RESOURCE_TYPE_CASTS(Script);
 
 }
 
 #endif