Remove resource type-specific fetching logic from ResourceFetcher

Source/core/fetch/LinkFetchResource.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+#ifndef LinkFetchResource_h
+#define LinkFetchResource_h
+
+#include "core/fetch/Resource.h"
+#include "core/fetch/ResourceClient.h"
+#include "core/fetch/ResourcePtr.h"
+
+namespace blink {
+
+class FetchRequest;
+class ResourceFetcher;
+
+class LinkFetchResource final : public Resource {
+public:
+    typedef ResourceClient ClientType;
+
+    static ResourcePtr<Resource> fetch(Resource::Type, FetchRequest&, ResourceFetcher*);
+    virtual ~LinkFetchResource();
+
+private:
+    class LinkResourceFactory : public ResourceFactory {
+    public:
+        LinkResourceFactory(Resource::Type type)
+            : ResourceFactory(type) { }
+
+        Resource* create(const ResourceRequest& request, const String& charset) const override
+        {
+            return new LinkFetchResource(request, type());
+        }
+    };
+    LinkFetchResource(const ResourceRequest&, Type);
+};
+
+}
+
+#endif // LinkFetchResource_h