Move display_service_unittests to services_unittests.

services/test/BUILD.gn

+# Copyright 2017 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.
+
+source_set("run_all_service_tests") {
+  # This target is in a separate directory because we want to expand DEPS so
+  # that it not all of //services can access //ui.
+  visibility = [ "//services:*" ]
+
+  testonly = true
+
+  sources = [
+    "run_all_service_tests.cc",
+  ]
+
+  deps = [
+    "//base",
+    "//base/test:test_support",
+    "//services/service_manager/public/cpp/test:common_initialization",
+    "//ui/base",
+  ]
+
+  data_deps = [
+    "//ui/resources:ui_test_pak_data",
+  ]
+
+  if (is_android) {
+    deps += [ "//mojo/android:libsystem_java" ]
+  }
+}