Inject JSON parsing in WebResource as a callback rather than inheritance

chrome/browser/plugins/plugins_resource_service.h

 // Copyright (c) 2012 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 CHROME_BROWSER_PLUGINS_PLUGINS_RESOURCE_SERVICE_H_
 #define CHROME_BROWSER_PLUGINS_PLUGINS_RESOURCE_SERVICE_H_
 
-#include "chrome/browser/web_resource/chrome_web_resource_service.h"
+#include "components/web_resource/web_resource_service.h"
 
 class PrefService;
 class PrefRegistrySimple;
 
 // This resource service periodically fetches plugin metadata
 // from a remote server and updates local state and PluginFinder.
-class PluginsResourceService : public ChromeWebResourceService {
+class PluginsResourceService : public web_resource::WebResourceService {
  public:
   explicit PluginsResourceService(PrefService* local_state);
   ~PluginsResourceService() override;
 
   void Init();
 
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
  private:
   // WebResourceService override to process the parsed information.
   void Unpack(const base::DictionaryValue& parsed_json) override;
 
   DISALLOW_COPY_AND_ASSIGN(PluginsResourceService);
 };
 
 #endif  // CHROME_BROWSER_PLUGINS_PLUGINS_RESOURCE_SERVICE_H_