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

components/contextual_search.gypi

 # 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.
 
 {
   'targets': [
     {
       # GN: //components/contextual_search:browser
       'target_name': 'contextual_search_browser',
       'type': 'static_library',
@@ skipping 33 matching lines @@
       ],
     },
     {
       # GN version: //components/contextual_search:mojo_bindings
       'target_name': 'contextual_search_mojo_bindings',
       'type': 'static_library',
       'sources': [
         'contextual_search/common/contextual_search_js_api_service.mojom',
         'contextual_search/common/overlay_page_notifier_service.mojom',
       ],
+      'variables': {
+        'use_new_wrapper_types': 'false',
+      },
       'includes': [
         '../mojo/mojom_bindings_generator.gypi',
       ],
     },
   ],
 }