[Sync] Migrate SyncInternalsMessageHandler off CallJavascriptFunctionUnsafe.

components/sync/driver/about_sync_util_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 "components/sync/driver/about_sync_util.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "components/sync/driver/fake_sync_service.h"
 #include "components/sync/engine/sync_status.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 20 matching lines @@
   }
 
   SyncCycleSnapshot GetLastCycleSnapshot() const override {
     return SyncCycleSnapshot();
   }
 };
 
 TEST(SyncUIUtilTestAbout, ConstructAboutInformationWithUnrecoverableErrorTest) {
   SyncServiceMock service;
 
-  std::unique_ptr<base::DictionaryValue> strings(ConstructAboutInformation(
-      &service, nullptr, version_info::Channel::UNKNOWN));
+  std::unique_ptr<base::DictionaryValue> strings(
+      ConstructAboutInformation(&service, version_info::Channel::UNKNOWN));
 
   EXPECT_TRUE(strings->HasKey("unrecoverable_error_detected"));
 }
 
 }  // namespace
 }  // namespace sync_ui_util
 }  // namespace syncer