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

mojo/shell/tests/connect/connect_test_driver.cc

Index: mojo/shell/tests/connect/connect_test_driver.cc
diff --git a/mojo/shell/tests/connect/connect_test_driver.cc b/mojo/shell/tests/connect/connect_test_driver.cc
index ace64df560a5d55659aa25f5f4fde6dbd1e08fa4..9e5a4cc03d1588d8a5bf88ec4fa7f04633ed5e56 100644
--- a/mojo/shell/tests/connect/connect_test_driver.cc
+++ b/mojo/shell/tests/connect/connect_test_driver.cc
@@ -37,10 +37,6 @@ class Driver : public mojo::ShellClient,
     connection->AddInterface<ClientProcessTest>(this);
     return true;
   }
-  void ShellConnectionLost() override {
-    // TODO: This should exit cleanly.
-    _exit(1);
-  }
 
   // mojo::InterfaceFactory<ConnectTestService>:
   void Create(mojo::Connection* connection,