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

mojo/shell/tests/connect/connect_test_package.cc

Index: mojo/shell/tests/connect/connect_test_package.cc
diff --git a/mojo/shell/tests/connect/connect_test_package.cc b/mojo/shell/tests/connect/connect_test_package.cc
index 1458e65f2e554210248a353739c909b995c2eb57..c5a1a0765dcd158e3828ba738c96cdef9cedc074 100644
--- a/mojo/shell/tests/connect/connect_test_package.cc
+++ b/mojo/shell/tests/connect/connect_test_package.cc
@@ -184,6 +184,12 @@
     connection->AddInterface<test::mojom::ConnectTestService>(this);
     return true;
   }
+  void ShellConnectionLost() override {
+    if (base::MessageLoop::current() &&
+        base::MessageLoop::current()->is_running()) {
+      base::MessageLoop::current()->QuitWhenIdle();
+    }
+  }
 
   // InterfaceFactory<mojom::ShellClientFactory>:
   void Create(Connection* connection,