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

mojo/mojom_bindings_generator.gypi

 # Copyright 2013 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.
 
 {
   'includes': [
     'mojom_bindings_generator_variables.gypi',
   ],
   'variables': {
     'variables': {
       'variables': {
         'for_blink%': 'false',
-        'use_new_wrapper_types%': 'false',
+        'use_new_wrapper_types%': 'true',
       },
       'for_blink%': '<(for_blink)',
       'use_new_wrapper_types%': '<(use_new_wrapper_types)',
       'conditions': [
         ['for_blink=="true"', {
           'mojom_output_languages%': 'c++',
           'mojom_variant%': 'blink',
           'mojom_generator_wtf_arg%': [
             '--for_blink',
           ],
@@ skipping 145 matching lines @@
         '<(PRODUCT_DIR)/java_mojo/<(_target_name)/src',
       ],
       'additional_input_paths': [
         '<@(mojom_bindings_generator_sources)',
         '<@(_sources)',
       ],
     },
   },
   'hard_dependency': 1,
 }