XXX test gn format everything

mojo/converters/surfaces/tests/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.
 
 # GYP version: mojo/mojo_converters.gypi:mojo_surfaces_lib_unittests
 test("mojo_surfaces_lib_unittests") {
   deps = [
     "//base",
     "//base/test:test_support",
     "//cc",
     "//cc/surfaces",
     "//gpu",
     "//mojo/converters/geometry",
     "//mojo/converters/surfaces",
     "//mojo/edk/test:run_all_unittests",
     "//mojo/environment:chromium",
     "//mojo/services/public/interfaces/geometry",
     "//mojo/services/public/interfaces/surfaces",
     "//skia",
     "//testing/gtest",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gfx:test_support",
   ]
 
-  sources = [ "surface_unittest.cc" ]
+  sources = [
+    "surface_unittest.cc",
+  ]
 }