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

mojo/shell/public/cpp/shell_connection.h

Index: mojo/shell/public/cpp/shell_connection.h
diff --git a/mojo/shell/public/cpp/shell_connection.h b/mojo/shell/public/cpp/shell_connection.h
index 3e00cd362c056cb2d1f69f123fb4a2294c43eb07..a05f6f136676a5ba022a190215be3b117c22fdc7 100644
--- a/mojo/shell/public/cpp/shell_connection.h
+++ b/mojo/shell/public/cpp/shell_connection.h
@@ -61,12 +61,7 @@
   // TODO(rockot): Remove this once we get rid of app tests.
   void SetAppTestConnectorForTesting(shell::mojom::ConnectorPtr connector);
 
-  // Specify a function to be called when the connection to the shell is lost.
-  void set_connection_lost_closure(const base::Closure& closure) {
-    connection_lost_closure_ = closure;
-  }
-
-private:
+ private:
   // shell::mojom::ShellClient:
   void Initialize(shell::mojom::IdentityPtr identity,
                   uint32_t id,
@@ -95,8 +90,6 @@
   Binding<shell::mojom::ShellClient> binding_;
   scoped_ptr<Connector> connector_;
 
-  base::Closure connection_lost_closure_;
-
   DISALLOW_COPY_AND_ASSIGN(ShellConnection);
 };