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

ios/testing/BUILD.gn

 # Copyright 2015 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("//testing/test.gni")
 
 source_set("ocmock_support") {
   testonly = true
 
   deps = [
     "//base",
   ]
 
   public_deps = [
     "//third_party/google_toolbox_for_mac",
     "//third_party/ocmock",
   ]
 
   sources = [
     "ocmock_complex_type_helper.h",
     "ocmock_complex_type_helper.mm",
   ]
 }
 
 test("ocmock_support_unittest") {
   deps = [
+    ":ocmock_support",
     "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/ocmock",
-    ":ocmock_support",
   ]
 }