Mojo: Replace RemotePtr with InterfacePtr and InterfaceImpl

mojo/shell/app_child_process.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.
 
-// TODO(vtl): mojom currently doesn't support nested modules. :(
-module mojo_shell {
+module mojo.shell {
 
-[Peer=AppChildControllerClient]
+[Client=AppChildControllerClient]
 interface AppChildController {
   // TODO(vtl): |service| should be of a more specific type.
   StartApp(string app_path, handle<message_pipe> service);
 };
 
-[Peer=AppChildController]
 interface AppChildControllerClient {
   AppCompleted(int32 result);
 };
 
-}  // module mojo_shell
+}  // module mojo.shell