[Sync] Migrate SyncInternalsMessageHandler off CallJavascriptFunctionUnsafe.

chrome/browser/sync/test/integration/profile_sync_service_harness.cc

 // Copyright 2013 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/sync/test/integration/profile_sync_service_harness.h"
 
 #include <cstddef>
 #include <iterator>
 #include <ostream>
 #include <sstream>
@@ skipping 525 matching lines @@
   }
   return os.str();
 }
 
 bool ProfileSyncServiceHarness::IsTypePreferred(syncer::ModelType type) {
   return service()->GetPreferredDataTypes().Has(type);
 }
 
 std::string ProfileSyncServiceHarness::GetServiceStatus() {
   std::unique_ptr<base::DictionaryValue> value(
-      syncer::sync_ui_util::ConstructAboutInformation(
-          service(), service()->signin(), chrome::GetChannel()));
+      syncer::sync_ui_util::ConstructAboutInformation(service(),
+                                                      chrome::GetChannel()));
   std::string service_status;
   base::JSONWriter::WriteWithOptions(
       *value, base::JSONWriter::OPTIONS_PRETTY_PRINT, &service_status);
   return service_status;
 }