Change ExternalApplicationRegistrar::Register API

mojo/shell/external_application_listener_posix.cc

Index: mojo/shell/external_application_listener_posix.cc
diff --git a/mojo/shell/external_application_listener_posix.cc b/mojo/shell/external_application_listener_posix.cc
index 42afa25b35ae01b278f25190a90d35cbb8c13454..5d56f06cedb5ff234342b07a946f377b56555f5c 100644
--- a/mojo/shell/external_application_listener_posix.cc
+++ b/mojo/shell/external_application_listener_posix.cc
@@ -55,9 +55,9 @@ class ExternalApplicationListenerPosix::RegistrarImpl
   embedder::ChannelInit channel_init;
 
  private:
-  virtual void Register(const String& app_url,
-                        InterfaceRequest<Shell> shell,
-                        const mojo::Closure& callback) override;
+  virtual void Register(
+      const String& app_url,
+      const mojo::Callback<void(ShellPtr)>& callback) override;
 
   const RegisterCallback register_callback_;
 };
@@ -191,10 +191,10 @@ void ExternalApplicationListenerPosix::RegistrarImpl::OnConnectionError() {
 
 void ExternalApplicationListenerPosix::RegistrarImpl::Register(
     const String& app_url,
-    InterfaceRequest<Shell> shell,
-    const mojo::Closure& callback) {
-  register_callback_.Run(app_url.To<GURL>(), shell.PassMessagePipe());
-  callback.Run();
+    const mojo::Callback<void(ShellPtr)>& callback) {
+  MessagePipe pipe;
+  register_callback_.Run(app_url.To<GURL>(), pipe.handle0.Pass());
+  callback.Run(MakeProxy<Shell>(pipe.handle1.Pass()));
 }
 
 }  // namespace shell