Inject JSON parsing in WebResource as a callback rather than inheritance

chrome/browser/web_resource/promo_resource_service_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 <utility>
 #include <vector>
 
 #include "base/json/json_reader.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/pref_service.h"
@@ skipping 42 matching lines @@
                            date_string);
 }
 
 }  // namespace
 
 class PromoResourceServiceTest : public testing::Test {
  public:
   // |promo_resource_service_| must be created after |local_state_|.
   PromoResourceServiceTest()
       : local_state_(TestingBrowserProcess::GetGlobal()),
-        promo_resource_service_(
-            new PromoResourceService(g_browser_process->local_state(),
-                                     kChannel)) {}
+        promo_resource_service_(new PromoResourceService(
+            g_browser_process->local_state(),
+            kChannel,
+            "en",
+            nullptr,
+            nullptr,
+            web_resource::WebResourceService::ParseJSONCallback())) {}
 
  protected:
   ScopedTestingLocalState local_state_;
   scoped_ptr<PromoResourceService> promo_resource_service_;
   base::MessageLoop loop_;
 };
 
 class NotificationPromoTest {
  public:
   explicit NotificationPromoTest(PrefService* local_state)
@@ skipping 501 matching lines @@
                   "What do you think of Chrome?",
                   // The starting date is in 1999 to make tests pass
                   // on Android devices with incorrect or unset date/time.
                   933672366,  // unix epoch for 3 Aug 1999 9:26:06 GMT.
                   1000, 200, 100, 3600, 400, 30);
   promo_test.InitPromoFromJson(true);
   local_state_.Get()->SetBoolean(prefs::kAppLauncherHasBeenEnabled, true);
   EXPECT_FALSE(promo_test.promo().CanShow());
 }
 #endif