Add ApplicationDelegate::Quit()

mojo/public/cpp/application/lib/application_delegate.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/public/cpp/application/application_delegate.h"
 
 namespace mojo {
 
 ApplicationDelegate::ApplicationDelegate() {
 }
 ApplicationDelegate::~ApplicationDelegate() {
 }
 
 void ApplicationDelegate::Initialize(ApplicationImpl* app) {
 }
 
 bool ApplicationDelegate::ConfigureIncomingConnection(
     ApplicationConnection* connection) {
   return true;
 }
 
 bool ApplicationDelegate::ConfigureOutgoingConnection(
     ApplicationConnection* connection) {
   return true;
 }
 
+void ApplicationDelegate::Quit() {
+}
+
 }  // namespace mojo