[Sync] Migrate SyncInternalsMessageHandler off CallJavascriptFunctionUnsafe.

chrome/browser/feedback/system_logs/log_sources/chrome_internal_log_source.cc

Index: chrome/browser/feedback/system_logs/log_sources/chrome_internal_log_source.cc
diff --git a/chrome/browser/feedback/system_logs/log_sources/chrome_internal_log_source.cc b/chrome/browser/feedback/system_logs/log_sources/chrome_internal_log_source.cc
index 29594961701b7cf4504ca257dbb57dcddb2f3661..c76b85d5c8f62e4675b80a68948954341196dce6 100644
--- a/chrome/browser/feedback/system_logs/log_sources/chrome_internal_log_source.cc
+++ b/chrome/browser/feedback/system_logs/log_sources/chrome_internal_log_source.cc
@@ -4,6 +4,9 @@
 
 #include "chrome/browser/feedback/system_logs/log_sources/chrome_internal_log_source.h"
 
+#include <memory>
+#include <string>
+
 #include "base/json/json_string_value_serializer.h"
 #include "base/strings/string_util.h"
 #include "base/sys_info.h"
@@ -169,8 +172,8 @@ void ChromeInternalLogSource::PopulateSyncLogs(SystemLogsResponse* response) {
   browser_sync::ProfileSyncService* service =
       ProfileSyncServiceFactory::GetInstance()->GetForProfile(profile);
   std::unique_ptr<base::DictionaryValue> sync_logs(
-      syncer::sync_ui_util::ConstructAboutInformation(
-          service, service->signin(), chrome::GetChannel()));
+      syncer::sync_ui_util::ConstructAboutInformation(service,
+                                                      chrome::GetChannel()));
 
   // Remove identity section.
   base::ListValue* details = NULL;