Update device/usb and its Mojo interface for variable size ISO packets.

extensions/test/data/api_test/usb/transfer_event/test.js

 // Copyright (c) 2012 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.
 
 var usb = chrome.usb;
 
 var tests = [
   function controlTransfer() {
     usb.findDevices({vendorId: 0, productId: 0}, function (devices) {
       var device = devices[0];
       var transfer = new Object();
       transfer.direction = "out";
       transfer.recipient = "device";
       transfer.requestType = "standard";
       transfer.request = 1;
       transfer.value = 2;
       transfer.index = 3;
       transfer.data = new ArrayBuffer(1);
 
       usb.controlTransfer(device, transfer, function (result) {
+        chrome.test.assertNoLastError();
         chrome.test.succeed();
       });
     });
   },
   function bulkTransfer() {
     usb.findDevices({vendorId: 0, productId: 0}, function (devices) {
       var device = devices[0];
       var transfer = new Object();
       transfer.direction = "out";
       transfer.endpoint = 1;
       transfer.data = new ArrayBuffer(1);
 
       usb.bulkTransfer(device, transfer, function (result) {
+        chrome.test.assertNoLastError();
         chrome.test.succeed();
       });
     });
   },
   function interruptTransfer() {
     usb.findDevices({vendorId: 0, productId: 0}, function (devices) {
       var device = devices[0];
       var transfer = new Object();
       transfer.direction = "out";
       transfer.endpoint = 2;
       transfer.data = new ArrayBuffer(1);
 
       usb.interruptTransfer(device, transfer, function (result) {
+        chrome.test.assertNoLastError();
         chrome.test.succeed();
       });
     });
   },
   function isochronousTransfer() {
     usb.findDevices({vendorId: 0, productId: 0}, function (devices) {
       var device = devices[0];
       var transfer = new Object();
       transfer.direction = "out";
       transfer.endpoint = 3;
       transfer.data = new ArrayBuffer(1);
 
       var isoTransfer = new Object();
       isoTransfer.transferInfo = transfer;
       isoTransfer.packets = 1;
       isoTransfer.packetLength = 1;
 
       usb.isochronousTransfer(device, isoTransfer, function (result) {
+        chrome.test.assertNoLastError();
         chrome.test.succeed();
       });
     });
   },
 ];
 
 chrome.test.runTests(tests);