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

services/tracing/tracing.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.
 
 {
   'targets': [
     {
       'target_name': 'tracing_interfaces',
       'type': 'none',
       'variables': {
         'mojom_files': [
           'public/interfaces/tracing.mojom',
         ],
         'mojom_include_path': '<(DEPTH)/mojo/services',
+        'use_new_wrapper_types': 'false',
       },
       'includes': [
         '../../mojo/mojom_bindings_generator_explicit.gypi',
       ],
     },
     {
       # Technically, these should be in the mojo_services.gyp, but this causes
       # a cycle since the ios generator can't have gyp files refer to each
       # other, even if the targets don't form a cycle.
       #
@@ skipping 27 matching lines @@
         'public/cpp/switches.cc',
         'public/cpp/switches.h',
         'public/cpp/tracing_impl.cc',
         'public/cpp/tracing_impl.h',
         'public/cpp/trace_provider_impl.cc',
         'public/cpp/trace_provider_impl.h',
       ],
     },
   ],
 }