Mojo C++ bindings: make the generator use STL/WTF string/vector/map by default.

services/shell/background/tests/BUILD.gn

 # Copyright 2016 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("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 static_library("test_support") {
   sources = [
@@ skipping 27 matching lines @@
 
   data_deps = [
     ":test_app",
   ]
 }
 
 mojom("test_app_bindings") {
   sources = [
     "test.mojom",
   ]
+
+  use_new_wrapper_types = false
 }
 
 mojo_native_application("test_app") {
   output_name = "background_shell_test_app"
 
   sources = [
     "test_service.cc",
   ]
 
   deps = [
     ":test_app_bindings",
     "//base",
     "//services/shell/public/cpp:sources",
     "//services/shell/public/interfaces",
   ]
 }