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

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

Index: extensions/test/data/api_test/usb/transfer_failure/test.js
diff --git a/extensions/test/data/api_test/usb/transfer_failure/test.js b/extensions/test/data/api_test/usb/transfer_failure/test.js
index 9348c184d48c9549a56625f67557f80c819c54db..09c53759a2f17df83dd58d888e676791ebf2903c 100644
--- a/extensions/test/data/api_test/usb/transfer_failure/test.js
+++ b/extensions/test/data/api_test/usb/transfer_failure/test.js
@@ -25,42 +25,10 @@
   };
 }
 
-function createIsochronousErrorTest(resultCode, errorMessage) {
-  return function() {
-    usb.findDevices({vendorId: 0, productId: 0}, function(devices) {
-      var device = devices[0];
-      var transfer = {
-        'transferInfo': {
-          'direction': "in",
-          'endpoint': 2,
-          'length': 160
-        },
-        'packets': 10,
-        'packetLength': 16
-      };
-      usb.isochronousTransfer(device, transfer, function (result) {
-        if (errorMessage) {
-          chrome.test.assertLastError(errorMessage);
-          // Device responds with only 8-byte packets and the second half fail.
-          chrome.test.assertTrue(result.data.byteLength == 40);
-        } else {
-          chrome.test.assertNoLastError();
-          // Device responds with a full set of 10 8-byte packets.
-          chrome.test.assertTrue(result.data.byteLength == 80);
-        }
-        chrome.test.assertTrue(resultCode == result.resultCode);
-        chrome.test.succeed();
-      });
-    });
-  };
-}
-
 var tests = [
   createErrorTest(0, undefined),
   createErrorTest(1, "Transfer failed."),
   createErrorTest(2, "Transfer timed out."),
-  createIsochronousErrorTest(0, undefined),
-  createIsochronousErrorTest(1, "Transfer failed."),
 ];
 
 chrome.test.runTests(tests);