Eliminate Launchable. Use Navigator instead.

mojo/services/public/interfaces/launcher/launcher.mojom

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import "../network/url_loader.mojom"
 
 module mojo.launcher {
 
 [Client=LauncherClient]
 interface Launcher {
   Launch(string url);
 };
 
 [Client=Launcher]
 interface LauncherClient {
   OnLaunch(string handler_url,
            mojo.URLResponse response,
            handle<data_pipe_consumer> response_body_stream);
 };
 
-interface Launchable {
-  OnLaunch(mojo.URLResponse response,
-           handle<data_pipe_consumer> response_body_stream,
-           uint32 node_id);
-};
-
 }