Moves components/mus/examples into mash

components/mus/example/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("//testing/test.gni")
-
-# Target that builders build.
-group("all") {
-  testonly = true
-
-  deps = [
-    ":example",
-    ":mustash_unittests",
-  ]
-}
-
-group("example") {
-  testonly = true
-
-  deps = [
-    "//components/mus/example/main",
-    "//components/mus/example/mock_sysui",
-    "//components/mus/example/views_examples",
-    "//components/mus/example/window_type_launcher",
-    "//mash/wm",
-    "//mojo/runner",
-  ]
-}
-
-test("mustash_unittests") {
-  deps = [
-    "//base",
-    "//base/test:run_all_unittests",
-    "//base/test:test_config",
-    "//base/test:test_support",
-    "//mash/wm:unittests",
-    "//mojo/platform_handle:platform_handle_impl",
-  ]
-}