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

mash/quick_launch/quick_launch_application.h

Index: mash/quick_launch/quick_launch_application.h
diff --git a/mash/quick_launch/quick_launch_application.h b/mash/quick_launch/quick_launch_application.h
index 93d72b295f5dd3412b3e78bcf78d5123fa371d80..130a1ddda3931185cd34ffc4a0863ae87a431749 100644
--- a/mash/quick_launch/quick_launch_application.h
+++ b/mash/quick_launch/quick_launch_application.h
@@ -28,7 +28,6 @@ class QuickLaunchApplication : public mojo::ShellClient {
                   const mojo::Identity& identity,
                   uint32_t id) override;
   bool AcceptConnection(mojo::Connection* connection) override;
-  void ShellConnectionLost() override;
 
   mojo::TracingImpl tracing_;
   scoped_ptr<views::AuraInit> aura_init_;