Revert of Replace libusb in the Linux/Chrome OS USB I/O path.

device/usb/usb.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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 85 matching lines @@
           ],
         }],
         ['OS=="android"', {
           'dependencies': [
             'device_usb_java',
             'device_usb_jni_headers',
           ],
           'dependencies!': [
             '../../third_party/libusb/libusb.gyp:libusb',
           ],
-          'sources': [
-            'usb_device_handle_usbfs.cc',
-            'usb_device_handle_usbfs.h',
-          ],
           # These sources are libusb-specific.
           'sources!': [
             'usb_context.cc',
             'usb_context.h',
             'usb_device_handle_impl.cc',
             'usb_device_handle_impl.h',
             'usb_device_impl.cc',
             'usb_device_impl.h',
             'usb_error.cc',
             'usb_error.h',
             'usb_service_impl.cc',
             'usb_service_impl.h',
           ]
         }],
         ['chromeos==1', {
           'dependencies': [
             '../../chromeos/chromeos.gyp:chromeos',
           ],
         }],
-        ['OS=="linux"', {
-          'sources': [
-            'usb_device_handle_usbfs.cc',
-            'usb_device_handle_usbfs.h',
-          ],
-          'sources!': [
-            'usb_device_handle_impl.cc',
-            'usb_device_handle_impl.h',
-          ]
-        }]
       ]
     },
     {
       'target_name': 'device_usb_mojo_bindings',
       'type': 'static_library',
       'sources': [
         'public/interfaces/chooser_service.mojom',
         'public/interfaces/device.mojom',
         'public/interfaces/device_manager.mojom',
       ],
@@ skipping 56 matching lines @@
           'type': 'none',
           'variables': {
             'source_file': 'usb_descriptors.h',
           },
           'includes': [ '../../build/android/java_cpp_enum.gypi' ],
         },
       ],
     }],
   ],
 }