Only enumerate known WinUSB devices using chrome.usb, to avoid errors

chrome/browser/resources/cryptotoken/usbgnubbydevice.js

 // Copyright 2014 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.
 
 /**
  * @fileoverview Implements a low-level gnubby driver based on chrome.usb.
  */
 'use strict';
 
 /**
@@ skipping 356 matching lines @@
 
   var lockArg = (u8.length > 0) ? u8[0] : 0;
   this.updateLock_(cid, cmd, lockArg);
 
   var wasEmpty = (this.txqueue.length == 0);
   this.txqueue.push(frame.buffer);
   if (wasEmpty) this.writeOneRequest_();
 };
 
 /**
+ * @const
+ */
+UsbGnubbyDevice.WINUSB_VID_PIDS = [
+  {'vendorId': 4176, 'productId': 529}  // Yubico WinUSB
+];
+
+/**
  * @param {function(Array)} cb Enumerate callback
  */
 UsbGnubbyDevice.enumerate = function(cb) {
-  var permittedDevs;
   var numEnumerated = 0;
   var allDevs = [];
 
   function enumerated(devs) {
     allDevs = allDevs.concat(devs);
-    if (++numEnumerated == permittedDevs.length) {
+    if (++numEnumerated == UsbGnubbyDevice.WINUSB_VID_PIDS.length) {
       cb(allDevs);
     }
   }
 
-  GnubbyDevice.getPermittedUsbDevices(function(devs) {
-    permittedDevs = devs;
-    for (var i = 0; i < devs.length; i++) {
-      chrome.usb.getDevices(devs[i], enumerated);
-    }
-  });
+  for (var i = 0; i < UsbGnubbyDevice.WINUSB_VID_PIDS.length; i++) {
+    chrome.usb.getDevices(UsbGnubbyDevice.WINUSB_VID_PIDS[i], enumerated);
+  }
 };
 
 /**
  * @typedef {?{
  *   address: number,
  *   type: string,
  *   direction: string,
  *   maximumPacketSize: number,
  *   synchronization: (string|undefined),
  *   usage: (string|undefined),
@@ skipping 116 matching lines @@
  */
 UsbGnubbyDevice.register = function(gnubbies) {
   var USB_GNUBBY_IMPL = {
     isSharedAccess: false,
     enumerate: UsbGnubbyDevice.enumerate,
     deviceToDeviceId: UsbGnubbyDevice.deviceToDeviceId,
     open: UsbGnubbyDevice.open
   };
   gnubbies.registerNamespace(UsbGnubbyDevice.NAMESPACE, USB_GNUBBY_IMPL);
 };