Remove the code added to make extensions compile on Aura Android.

extensions/extensions.gypi

 # 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.
 
 {
   'variables': {
     'extensions_common_constants_sources': [
       'common/constants.cc',
       'common/constants.h',
     ],
@@ skipping 12 matching lines @@
       'common/api/bluetooth/bluetooth_manifest_permission.cc',
       'common/api/bluetooth/bluetooth_manifest_permission.h',
       'common/api/declarative/declarative_manifest_data.cc',
       'common/api/declarative/declarative_manifest_data.h',
       'common/api/declarative/declarative_manifest_handler.cc',
       'common/api/declarative/declarative_manifest_handler.h',
       'common/api/messaging/message.h',
       'common/api/printer_provider/usb_printer_manifest_data.cc',
       'common/api/printer_provider/usb_printer_manifest_data.h',
       'common/api/printer_provider/usb_printer_manifest_handler.cc',
-      'common/api/printer_provider/usb_printer_manifest_handler_android.cc',
       'common/api/printer_provider/usb_printer_manifest_handler.h',
       'common/api/sockets/sockets_manifest_data.cc',
       'common/api/sockets/sockets_manifest_data.h',
       'common/api/sockets/sockets_manifest_handler.cc',
       'common/api/sockets/sockets_manifest_handler.h',
       'common/api/sockets/sockets_manifest_permission.cc',
       'common/api/sockets/sockets_manifest_permission.h',
       'common/cast/cast_cert_validator.cc',
       'common/cast/cast_cert_validator.h',
       'common/common_manifest_handlers.cc',
@@ skipping 1046 matching lines @@
       'test/result_catcher.h',
       'test/test_content_utility_client.cc',
       'test/test_content_utility_client.h',
       'test/test_extensions_client.cc',
       'test/test_extensions_client.h',
       'test/test_permission_message_provider.cc',
       'test/test_permission_message_provider.h',
     ],
   },
 }