Convert some GN test support targets to static libs.

services/ui/ws/BUILD.gn

 # Copyright 2014 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("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//mojo/public/mojo_application.gni")
 import("//mojo/public/mojo_application_manifest.gni")
 
-source_set("lib") {
+static_library("lib") {
   sources = [
     "accelerator.cc",
     "accelerator.h",
     "access_policy.h",
     "access_policy_delegate.h",
     "accessibility_manager.cc",
     "accessibility_manager.h",
     "animation_runner.cc",
     "animation_runner.h",
     "animation_runner_observer.h",
@@ skipping 108 matching lines @@
     "//ui/platform_window",
     "//ui/platform_window:platform_impls",
     "//ui/platform_window/mojo",
   ]
 
   if (use_ozone) {
     public_deps += [ "//ui/ozone:ozone" ]
   }
 }
 
-source_set("test_interface") {
+static_library("test_interface") {
   sources = [
     "window_server_test_impl.cc",
     "window_server_test_impl.h",
   ]
 
   deps = [
     ":lib",
     "//mojo/public/cpp/bindings:bindings",
     "//services/ui/public/interfaces",
     "//ui/gfx",
   ]
 }
 
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
 
   sources = [
     "test_change_tracker.cc",
     "test_change_tracker.h",
   ]
 
   deps = [
     "//base",
     "//mojo/common",
@@ skipping 76 matching lines @@
 
   data_deps = [
     ":mus_ws_unittests_app_manifest",
   ]
 }
 
 mojo_application_manifest("mus_ws_unittests_app_manifest") {
   application_name = "mus_ws_unittests_app"
   source = "mus_ws_unittests_app_manifest.json"
 }