Separate usb device handle from usb device. (deprecate)

chrome/test/data/extensions/api_test/usb/zero_length_transfer/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 zeroLengthTransfer() {
-    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(0);
-      usb.bulkTransfer(device, transfer, function (result) {
-        chrome.test.succeed();
+    usb.getDevices({vendorId: 0, productId: 0}, function(devices) {
+      usb.openDevice(devices[0], function(device) {
+        var transfer = new Object();
+        transfer.direction = "out";
+        transfer.endpoint = 1;
+        transfer.data = new ArrayBuffer(0);
+        usb.bulkTransfer(device, transfer, function(result) {
+          chrome.test.succeed();
+        });
       });
     });
-  },
+  }
 ];
 
 chrome.test.runTests(tests);