XXX test gn format everything

mojo/edk/system/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.
 
 config("system_config") {
   defines = [
     # Ensures that dependent projects import the core functions on Windows.
     "MOJO_USE_SYSTEM_IMPL",
   ]
 }
@@ skipping 107 matching lines @@
     "message_pipe_test_utils.h",
     "message_pipe_unittest.cc",
     "multiprocess_message_pipe_unittest.cc",
     "options_validation_unittest.cc",
     "platform_handle_dispatcher_unittest.cc",
     "raw_channel_unittest.cc",
     "remote_message_pipe_unittest.cc",
     "run_all_unittests.cc",
     "shared_buffer_dispatcher_unittest.cc",
     "simple_dispatcher_unittest.cc",
+
     # TODO(vtl): Factor test_utils.* into their own source set.
     "test_utils.cc",
     "test_utils.h",
     "waiter_list_unittest.cc",
     "waiter_test_utils.cc",
     "waiter_test_utils.h",
     "waiter_unittest.cc",
   ]
 
   deps = [
@@ skipping 20 matching lines @@
 
   deps = [
     ":system",
     "//base",
     "//base/test:test_support",
     "//base/test:test_support_perf",
     "//mojo/edk/test:test_support",
     "//testing/gtest",
   ]
 }