mojo_js_standalone will quit after the last JSApp quits

mojo/apps/js/js_app.h

 // 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.
 
 #ifndef MOJO_APPS_JS_JS_APP_H_
 #define MOJO_APPS_JS_JS_APP_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread.h"
 #include "gin/public/isolate_holder.h"
@@ skipping 12 matching lines @@
 
 class JSApp {
  public:
   JSApp(ApplicationDelegateImpl* app_delegate_impl);
   virtual ~JSApp();
 
   // Launch this app on a new thread. This method can be called on any thread.
   // This method causes Load() and then Run() to run on a new thread.
   bool Start();
 
-
   // Subclasses must return the JS source code for this app's main script and
   // the filename or URL that identifies the script's origin. This method will
   // be called from this app's thread.
   virtual bool Load(std::string* source, std::string* file_name) = 0;
 
   // Called by the JS mojo module to quit this JS app. See mojo_module.cc.
   void Quit();
 
   // Called by the JS mojo module to connect to a Mojo service.
   Handle ConnectToService(const std::string& application_url,
@@ skipping 15 matching lines @@
   scoped_ptr<gin::IsolateHolder> isolate_holder_;
   scoped_ptr<gin::ShellRunner> shell_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(JSApp);
 };
 
 }  // namespace apps
 }  // namespace mojo
 
 #endif  // MOJO_APPS_JS_JS_APP_H_