media: Quit MojoMediaApplication when no service is bound.

mojo/application/public/cpp/app_lifetime_helper.h

Index: mojo/application/public/cpp/app_lifetime_helper.h
diff --git a/mojo/application/public/cpp/app_lifetime_helper.h b/mojo/application/public/cpp/app_lifetime_helper.h
index 93005ef45b14437ada131bfb54a3e339a7adb81b..dbbca18e63fc396f9c3f9c3b850185a2342f1170 100644
--- a/mojo/application/public/cpp/app_lifetime_helper.h
+++ b/mojo/application/public/cpp/app_lifetime_helper.h
@@ -34,11 +34,16 @@ class AppRefCount {
   friend AppLifetimeHelper;
 
   AppRefCount(AppLifetimeHelper* app_lifetime_helper,
+              base::TimeDelta release_delay_,
               scoped_refptr<base::SingleThreadTaskRunner> app_task_runner);
 
   // Don't need to use weak ptr because if the app thread is alive that means
   // app is.
   AppLifetimeHelper* app_lifetime_helper_;
+
+  // Delay before releasing the ref-count.
+  base::TimeDelta release_delay_;
+
   scoped_refptr<base::SingleThreadTaskRunner> app_task_runner_;
 
 #ifndef NDEBUG
@@ -61,6 +66,7 @@ class AppLifetimeHelper {
   ~AppLifetimeHelper();
 
   scoped_ptr<AppRefCount> CreateAppRefCount();
+  scoped_ptr<AppRefCount> CreateAppRefCount(base::TimeDelta release_delay);
 
  private:
   friend AppRefCount;