Eliminate ShellClientFactoryConnection & just have the ApplicationManager do it.

mojo/shell/public/interfaces/shell_client_factory.mojom

 // Copyright 2016 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.
 
 module mojo.shell.mojom;
 
 import "mojo/shell/public/interfaces/shell_client.mojom";
 
 // Implemented by a package containing multiple applications identified by
 // unique URLs.
 interface ShellClientFactory {
-  CreateShellClient(ShellClient& shell_client, string url) => ();
+  CreateShellClient(ShellClient& shell_client, string url);
 };