Mojo: Use InterfaceFactory<Interface> for service registration

mojo/public/cpp/bindings/interface_impl.h

Index: mojo/public/cpp/bindings/interface_impl.h
diff --git a/mojo/public/cpp/bindings/interface_impl.h b/mojo/public/cpp/bindings/interface_impl.h
index 4a78cb4b05a1f11b4380a001aab45fa76e91a8e2..387c62d0a41ec522c895738db2fbfd00325d3c40 100644
--- a/mojo/public/cpp/bindings/interface_impl.h
+++ b/mojo/public/cpp/bindings/interface_impl.h
@@ -55,6 +55,15 @@ class InterfaceImpl : public internal::InterfaceImplBase<Interface> {
   MOJO_DISALLOW_COPY_AND_ASSIGN(InterfaceImpl);
 };
 
+// Use InterfaceImplDeleteOnError if your interface implementation should delete
+// itself when detecting a connection error.
+template <typename Interface>
+class InterfaceImplDeleteOnError : public InterfaceImpl<Interface> {
+ public:
+  virtual ~InterfaceImplDeleteOnError() {}
+  virtual void OnConnectionError() { delete this; }
+};
+
 // Takes an instance of an InterfaceImpl<..> subclass and binds it to the given
 // MessagePipe. The instance is returned for convenience in member initializer
 // lists, etc. If the pipe is closed, the instance's OnConnectionError method