Inject JSON parsing in WebResource as a callback rather than inheritance

chrome/browser/web_resource/promo_resource_service_mobile_ntp_unittest.cc

 // 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.
 
 #include <vector>
 
 #include "base/json/json_reader.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/testing_pref_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "chrome/browser/web_resource/notification_promo.h"
 #include "chrome/browser/web_resource/notification_promo_mobile_ntp.h"
 #include "chrome/browser/web_resource/promo_resource_service.h"
 #include "components/version_info/version_info.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 version_info::Channel kChannel = version_info::Channel::UNKNOWN;
 }
 
 class PromoResourceServiceMobileNtpTest : public testing::Test {
  public:
   PromoResourceServiceMobileNtpTest() {
     NotificationPromo::RegisterPrefs(local_state_.registry());
-    promo_resource_service_.reset(
-        new PromoResourceService(&local_state_, kChannel));
+    promo_resource_service_.reset(new PromoResourceService(
+        &local_state_, kChannel, "en", nullptr, nullptr,
+        web_resource::WebResourceService::ParseJSONCallback()));
   }
 
  protected:
   TestingPrefServiceSimple local_state_;
   // |promo_resource_service_| must be created after |local_state_|.
   scoped_ptr<PromoResourceService> promo_resource_service_;
   base::MessageLoop loop_;
 };
 
 class NotificationPromoMobileNtpTest {
@@ skipping 137 matching lines @@
       "It\'s simple. Go http://www.google.com/chrome/",
       "ACTION_EMAIL", "This is the body.", "XXX value");
 
   promo_test.InitPromoFromJson(true);
 
   // Second time should not trigger a notification.
   promo_test.InitPromoFromJson(false);
 
   promo_test.TestInitFromPrefs();
 }