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

device/vr/vr.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       # GN version: //device/vr:mojo_bindings
       'target_name': 'device_vr_mojo_bindings',
       'type': 'static_library',
       'includes': [
         '../../mojo/mojom_bindings_generator.gypi',
       ],
       'sources': [
         'vr_service.mojom',
       ],
+      'variables': {
+        'use_new_wrapper_types': 'false',
+      },
     },
     {
       # GN version: //device/vr:mojo_bindings_blink
       'target_name': 'device_vr_mojo_bindings_for_blink',
       'type': 'static_library',
       'variables': {
         'for_blink': 'true',
+        'use_new_wrapper_types': 'false',
       },
       'includes': [
         '../../mojo/mojom_bindings_generator.gypi',
       ],
       'sources': [
         'vr_service.mojom',
       ],
     },
   ],
 }