Remove MojoApplication[Host] & ApplicationSetup.

content/content_child.gypi

 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../components/mime_util/mime_util.gyp:mime_util',
     '../components/scheduler/scheduler.gyp:scheduler',
     '../components/tracing.gyp:tracing',
     '../components/webcrypto/webcrypto.gyp:webcrypto',
@@ skipping 111 matching lines @@
       'child/indexed_db/indexed_db_message_filter.cc',
       'child/indexed_db/indexed_db_message_filter.h',
       'child/indexed_db/webidbcursor_impl.cc',
       'child/indexed_db/webidbcursor_impl.h',
       'child/indexed_db/webidbdatabase_impl.cc',
       'child/indexed_db/webidbdatabase_impl.h',
       'child/indexed_db/webidbfactory_impl.cc',
       'child/indexed_db/webidbfactory_impl.h',
       'child/memory/child_memory_message_filter.cc',
       'child/memory/child_memory_message_filter.h',
-      'child/mojo/mojo_application.cc',
-      'child/mojo/mojo_application.h',
       'child/mojo/type_converters.h',
       'child/notifications/notification_data_conversions.cc',
       'child/notifications/notification_data_conversions.h',
       'child/notifications/notification_dispatcher.cc',
       'child/notifications/notification_dispatcher.h',
       'child/notifications/notification_manager.cc',
       'child/notifications/notification_manager.h',
       'child/permissions/permission_dispatcher.cc',
       'child/permissions/permission_dispatcher.h',
       'child/permissions/permission_dispatcher_thread_proxy.cc',
@@ skipping 112 matching lines @@
         '../build/android/ndk.gyp:cpu_features',
       ],
     }],
     ['enable_plugins==0', {
       'sources!': [
         'child/browser_font_resource_trusted.cc',
       ],
     }],
   ],
 }