media: Quit MojoMediaApplication when no service is bound.

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

Index: mojo/application/public/cpp/lib/app_lifetime_helper.cc
diff --git a/mojo/application/public/cpp/lib/app_lifetime_helper.cc b/mojo/application/public/cpp/lib/app_lifetime_helper.cc
index 4d12339138056b4b39172699a7ca41074b9d816c..c3ed08534c9d897ffa88f4bb5c7ec4a80e4e8e91 100644
--- a/mojo/application/public/cpp/lib/app_lifetime_helper.cc
+++ b/mojo/application/public/cpp/lib/app_lifetime_helper.cc
@@ -12,8 +12,10 @@ namespace mojo {
 
 AppRefCount::AppRefCount(
     AppLifetimeHelper* app_lifetime_helper,
+    base::TimeDelta release_delay,
     scoped_refptr<base::SingleThreadTaskRunner> app_task_runner)
     : app_lifetime_helper_(app_lifetime_helper),
+      release_delay_(release_delay),
       app_task_runner_(app_task_runner) {
 }
 
@@ -27,6 +29,14 @@ AppRefCount::~AppRefCount() {
   }
 #endif
 
+  if (!release_delay_.is_zero()) {
+    app_task_runner_->PostDelayedTask(
+        FROM_HERE, base::Bind(&AppLifetimeHelper::Release,
+                              base::Unretained(app_lifetime_helper_)),
+        release_delay_);
+    return;
+  }
+
   if (app_task_runner_->BelongsToCurrentThread()) {
     app_lifetime_helper_->Release();
     return;
@@ -59,8 +69,8 @@ scoped_ptr<AppRefCount> AppRefCount::Clone() {
   }
 #endif
 
-  return make_scoped_ptr(new AppRefCount(
-      app_lifetime_helper_, app_task_runner_));
+  return make_scoped_ptr(
+      new AppRefCount(app_lifetime_helper_, release_delay_, app_task_runner_));
 }
 
 AppLifetimeHelper::AppLifetimeHelper(ApplicationImpl* app)
@@ -71,9 +81,14 @@ AppLifetimeHelper::~AppLifetimeHelper() {
 }
 
 scoped_ptr<AppRefCount> AppLifetimeHelper::CreateAppRefCount() {
+  return CreateAppRefCount(base::TimeDelta());
+}
+
+scoped_ptr<AppRefCount> AppLifetimeHelper::CreateAppRefCount(
+    base::TimeDelta release_delay) {
   AddRef();
   return make_scoped_ptr(new AppRefCount(
-      this, base::MessageLoop::current()->task_runner()));
+      this, release_delay, base::MessageLoop::current()->task_runner()));
 }
 
 void AppLifetimeHelper::AddRef() {