[PoC] Reformat all BUILD.gn and *.gni files with new gn.

ui/shell_dialogs/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")
 if (is_android) {
   import("//build/config/android/config.gni")
 }
 
@@ skipping 66 matching lines @@
 }
 
 test("shell_dialogs_unittests") {
   sources = [
     "select_file_dialog_win_unittest.cc",
   ]
 
   deps = [
     ":shell_dialogs",
     "//base",
+    "//base/test:run_all_unittests",
     "//base/test:test_support",
-    "//base/test:run_all_unittests",
     "//testing/gtest",
   ]
 }