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

ui/platform_window/mojo/BUILD.gn

 # 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.
 
 import("//mojo/public/tools/bindings/mojom.gni")
 
 # This target does NOT depend on skia. One can depend on this target to avoid
 # picking up a dependency on skia.
 component("mojo") {
   output_name = "mojo_ime_lib"
@@ skipping 13 matching lines @@
     "ime_type_converters.cc",
     "ime_type_converters.h",
     "mojo_ime_export.h",
   ]
 }
 
 mojom("interfaces") {
   sources = [
     "text_input_state.mojom",
   ]
+
+  use_new_wrapper_types = false
 }