Revert of Service Manager: Remove ServiceContext* arg from Service::OnStart()

media/mojo/services/media_service.cc

Index: media/mojo/services/media_service.cc
diff --git a/media/mojo/services/media_service.cc b/media/mojo/services/media_service.cc
index 7463d27b7e90b5a14b27319ebe227ef7a5f21254..aa922d5b4a1296d56cc8db944f471de10150cf8d 100644
--- a/media/mojo/services/media_service.cc
+++ b/media/mojo/services/media_service.cc
@@ -25,10 +25,10 @@
 
 MediaService::~MediaService() {}
 
-void MediaService::OnStart() {
+void MediaService::OnStart(service_manager::ServiceContext* context) {
   ref_factory_.reset(new service_manager::ServiceContextRefFactory(
       base::Bind(&service_manager::ServiceContext::RequestQuit,
-                 base::Unretained(context()))));
+                 base::Unretained(context))));
   mojo_media_client_->Initialize();
 }