Making Mandoline apps notice when all the objects they vended are gone so that it can terminate.

mojo/services/network/udp_socket_impl.h

Index: mojo/services/network/udp_socket_impl.h
diff --git a/mojo/services/network/udp_socket_impl.h b/mojo/services/network/udp_socket_impl.h
index c2070bf54cf6edb5c58a80f6a3acdc3690f517bc..2c5a36ad630369f74908959eb25d331268250fc1 100644
--- a/mojo/services/network/udp_socket_impl.h
+++ b/mojo/services/network/udp_socket_impl.h
@@ -9,6 +9,7 @@
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "mojo/application/app_lifetime_helper.h"
 #include "mojo/services/network/public/interfaces/udp_socket.mojom.h"
 #include "net/base/ip_endpoint.h"
 #include "net/udp/udp_socket.h"
@@ -26,7 +27,8 @@ class UDPSocketImpl : public UDPSocket {
  public:
   // The lifetime of a new UDPSocketImpl is bound to the connection associated
   // with |request|.
-  explicit UDPSocketImpl(InterfaceRequest<UDPSocket> request);
+  UDPSocketImpl(InterfaceRequest<UDPSocket> request,
+                scoped_ptr<mojo::AppRefCount> app_refcount);
   ~UDPSocketImpl() override;
 
   // UDPSocket implementation.
@@ -119,6 +121,8 @@ class UDPSocketImpl : public UDPSocket {
   // The maximum size of the |pending_send_requests_| queue.
   size_t max_pending_send_requests_;
 
+  scoped_ptr<mojo::AppRefCount> app_refcount_;
+
   DISALLOW_COPY_AND_ASSIGN(UDPSocketImpl);
 };