Inject JSON parsing in WebResource as a callback rather than inheritance

chrome/browser/web_resource/chrome_web_resource_service.cc

-// 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.
-
-#include "chrome/browser/web_resource/chrome_web_resource_service.h"
-
-#include <string>
-
-#include "base/memory/ref_counted.h"
-#include "chrome/browser/browser_process.h"
-#include "chrome/common/chrome_switches.h"
-#include "components/safe_json/safe_json_parser.h"
-#include "url/gurl.h"
-
-ChromeWebResourceService::ChromeWebResourceService(
-    PrefService* prefs,
-    const GURL& web_resource_server,
-    bool apply_locale_to_url,
-    const char* last_update_time_pref_name,
-    int start_fetch_delay_ms,
-    int cache_update_delay_ms)
-    : web_resource::WebResourceService(
-          prefs,
-          web_resource_server,
-          apply_locale_to_url ? g_browser_process->GetApplicationLocale()
-                              : std::string(),
-          last_update_time_pref_name,
-          start_fetch_delay_ms,
-          cache_update_delay_ms,
-          g_browser_process->system_request_context(),
-          switches::kDisableBackgroundNetworking) {
-}
-
-ChromeWebResourceService::~ChromeWebResourceService() {
-}
-
-void ChromeWebResourceService::ParseJSON(
-    const std::string& data,
-    const SuccessCallback& success_callback,
-    const ErrorCallback& error_callback) {
-  safe_json::SafeJsonParser::Parse(data, success_callback, error_callback);
-}