Mojo: Make GetDefault{AsyncWaiter,Logger} static methods of Environment.

mojo/mojo.gyp

 # 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.
 
 {
   'target_defaults': {
     'conditions': [
       ['mojo_shell_debug_url != ""', {
         'defines': [
           'MOJO_SHELL_DEBUG=1',
@@ skipping 376 matching lines @@
     },
     {
       # GN version: //mojo/environment:chromium
       'target_name': 'mojo_environment_chromium',
       'type': 'static_library',
       'dependencies': [
         'mojo_common_lib',
         'mojo_environment_chromium_impl',
       ],
       'sources': [
-        'environment/default_async_waiter.cc',
-        'environment/default_logger.cc',
         'environment/environment.cc',
       ],
       'include_dirs': [
         '..',
       ],
       'export_dependent_settings': [
         'mojo_environment_chromium_impl',
       ],
     },
     {
@@ skipping 534 matching lines @@
             'views/native_widget_view_manager.cc',
             'views/native_widget_view_manager.h',
             'views/views_init.cc',
             'views/views_init.h',
           ],
         },
       ],
     }],
   ],
 }