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

device/usb/BUILD.gn

 # Copyright (c) 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.
 
 import("//build/config/features.gni")
 
 assert(!is_ios)
 
 if (is_android) {
   import("//build/config/android/rules.gni")  # For generate_jni().
@@ skipping 41 matching lines @@
     "//device/core",
     "//net",
   ]
 
   if (use_udev) {
     deps += [ "//device/udev_linux" ]
   }
 
   if (is_android) {
     deps += [ ":jni_headers" ]
+    sources += [
+      "usb_device_handle_usbfs.cc",
+      "usb_device_handle_usbfs.h",
+    ]
   } else {
     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",
     ]
 
     deps += [ "//third_party/libusb" ]
   }
 
+  if (is_linux || is_chromeos) {
+    sources += [
+      "usb_device_handle_usbfs.cc",
+      "usb_device_handle_usbfs.h",
+    ]
+    sources -= [
+      "usb_device_handle_impl.cc",
+      "usb_device_handle_impl.h",
+    ]
+  }
+
   if (is_chromeos) {
     deps += [
       "//chromeos",
       "//dbus",
     ]
   }
 }
 
 source_set("mocks") {
   testonly = true
@@ skipping 58 matching lines @@
   }
 
   android_library("java") {
     java_files = java_sources_needing_jni
     deps = [
       "//base:base_java",
     ]
     srcjar_deps = [ ":usb_descriptors_javagen" ]
   }
 }