MD History: update (instead of re-create) data sources on sign in change

content/browser/webui/url_data_source_impl.cc

Index: content/browser/webui/url_data_source_impl.cc
diff --git a/content/browser/webui/url_data_source_impl.cc b/content/browser/webui/url_data_source_impl.cc
index 3c06d881a34b998ae0180e230a4fe2b5a1cb8377..2ad8bc55e7469add854027c9cf3266f4d80a7c05 100644
--- a/content/browser/webui/url_data_source_impl.cc
+++ b/content/browser/webui/url_data_source_impl.cc
@@ -45,6 +45,10 @@ void URLDataSourceImpl::SendResponse(
                                      this, request_id, std::move(bytes)));
 }
 
+bool URLDataSourceImpl::IsWebUIDataSourceImpl() const {
+  return false;
+}
+
 void URLDataSourceImpl::SendResponseOnIOThread(
     int request_id,
     scoped_refptr<base::RefCountedMemory> bytes) {