Convert mus apptests to shelltests

mojo/shell/tests/BUILD.gn

 # 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.
 
 import("//mojo/public/mojo_application.gni")
 import("//mojo/public/mojo_application_manifest.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 group("tests") {
   testonly = true
   deps = [
     ":mojo_shell_unittests",
   ]
 }
 
 test("mojo_shell_unittests") {
   sources = [
     "loader_unittest.cc",
-    "mojo_shell_unittests.cc",
   ]
 
   deps = [
     ":interfaces",
     "//base",
     "//base/test:test_support",
-    "//mojo/edk/system",
-    "//mojo/public/cpp/system",
+    "//mojo/public/cpp/bindings",
     "//mojo/shell",
     "//mojo/shell/background:lib",
     "//mojo/shell/background:main",
     "//mojo/shell/background/tests:unittests",
     "//mojo/shell/public/cpp",
+    "//mojo/shell/public/cpp/test:run_all_shelltests",
+    "//mojo/shell/public/interfaces",
     "//mojo/shell/tests/connect",
     "//mojo/shell/tests/lifecycle",
     "//mojo/shell/tests/shell",
     "//mojo/util:filename_util",
     "//testing/gtest",
   ]
 }
 
 mojom("interfaces") {
   sources = [
     "test.mojom",
   ]
 }