Mojo: Simplify typemap usage.

components/password_manager.gypi

 # Copyright 2014 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 version: //components/password_manager/core/browser
       'target_name': 'password_manager_core_browser',
       'type': 'static_library',
@@ skipping 240 matching lines @@
     },
   ],
   'conditions': [
     ['OS != "ios"', {
       'targets': [
         {
           # GN version: //components/password_manager/content/public/interfaces
           'target_name': 'password_manager_content_mojo_bindings_mojom',
           'type': 'none',
           'variables': {
-            'mojom_extra_generator_args': [
-              '--typemap', '<(DEPTH)/url/mojo/origin.typemap',
-            ],
             'mojom_files': [
               'password_manager/content/public/interfaces/credential_manager.mojom',
             ],
+            'mojom_typemaps': [
+              '<(DEPTH)/url/mojo/origin.typemap',
+            ],
           },
           'include_dirs': [
             '..',
           ],
           'includes': [
             '../mojo/mojom_bindings_generator_explicit.gypi',
           ],
         },
         {
           # GN version: //components/password_manager/content/public/cpp
@@ skipping 72 matching lines @@
             'password_manager/content/browser/credential_manager_impl.cc',
             'password_manager/content/browser/credential_manager_impl.h',
             'password_manager/content/browser/password_manager_internals_service_factory.cc',
             'password_manager/content/browser/password_manager_internals_service_factory.h',
           ],
         },
       ],
     }],
   ],
 }