Move various Shell tests into a subdir.

mojo/shell/package_test.mojom

Index: mojo/shell/package_test.mojom
diff --git a/mojo/shell/package_test.mojom b/mojo/shell/package_test.mojom
deleted file mode 100644
index 1bcebcb29b109face6929fac1ebfc791a0312fb3..0000000000000000000000000000000000000000
--- a/mojo/shell/package_test.mojom
+++ /dev/null
@@ -1,9 +0,0 @@
-// 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.test.mojom;
-
-interface PackageTestService {
-  GetName() => (string name);
-};