Revert of Quit the message loop by default in ShellConnectionLost when ApplicationRunner is used

mojo/services/network/network_service_delegate.cc

Index: mojo/services/network/network_service_delegate.cc
diff --git a/mojo/services/network/network_service_delegate.cc b/mojo/services/network/network_service_delegate.cc
index b2573317f66c0b59075cfe3c50715945eb8d3aa7..19709285c6471a2b9a2a319de7680e885d80d8ae 100644
--- a/mojo/services/network/network_service_delegate.cc
+++ b/mojo/services/network/network_service_delegate.cc
@@ -78,6 +78,10 @@
   return true;
 }
 
+void NetworkServiceDelegate::ShellConnectionLost() {
+  base::MessageLoop::current()->QuitWhenIdle();
+}
+
 void NetworkServiceDelegate::Create(Connection* connection,
                                     InterfaceRequest<NetworkService> request) {
   new NetworkServiceImpl(ref_factory_.CreateRef(), std::move(request));