Replace ChildController with ShellClientFactory

mojo/shell/runner/child/BUILD.gn

 # Copyright 2015 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("//mojo/public/mojo_application.gni")
 import("//mojo/public/mojo_application_manifest.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 group("child") {
   testonly = true
   deps = [
     ":apptests",
     ":lib",
   ]
 }
 
 source_set("lib") {
   sources = [
     "runner_connection.cc",
     "runner_connection.h",
   ]
 
   deps = [
-    ":interfaces",
     "//base",
     "//mojo/edk/system",
     "//mojo/message_pump",
     "//mojo/platform_handle:platform_handle_impl",
     "//mojo/shell/public/interfaces",
     "//mojo/shell/runner/common",
   ]
 }
 
-mojom("interfaces") {
-  sources = [
-    "child_controller.mojom",
-  ]
-
-  deps = [
-    "//mojo/shell/public/interfaces",
-  ]
-
-  import_dirs = [ "//mojo/services" ]
-}
-
 source_set("test_native_main") {
   sources = [
     "test_native_main.cc",
     "test_native_main.h",
   ]
 
   public_deps = [
     "//mojo/shell/runner:init",
   ]
 
@@ skipping 56 matching lines @@
 
   deps = [
     ":apptest_interfaces",
     ":lib",
     ":test_native_main",
     "//base",
     "//build/config/sanitizers:deps",
     "//mojo/shell/public/cpp",
   ]
 }