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

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

Index: extensions/test/data/api_test/usb/transfer_event/test.js
diff --git a/extensions/test/data/api_test/usb/transfer_event/test.js b/extensions/test/data/api_test/usb/transfer_event/test.js
index 294864a7595ef248a4dd626d2460a302b450e612..9d065f1647ca3f3390a2fc907f58d0893ec46807 100644
--- a/extensions/test/data/api_test/usb/transfer_event/test.js
+++ b/extensions/test/data/api_test/usb/transfer_event/test.js
@@ -18,6 +18,7 @@ var tests = [
       transfer.data = new ArrayBuffer(1);
 
       usb.controlTransfer(device, transfer, function (result) {
+        chrome.test.assertNoLastError();
         chrome.test.succeed();
       });
     });
@@ -31,6 +32,7 @@ var tests = [
       transfer.data = new ArrayBuffer(1);
 
       usb.bulkTransfer(device, transfer, function (result) {
+        chrome.test.assertNoLastError();
         chrome.test.succeed();
       });
     });
@@ -44,6 +46,7 @@ var tests = [
       transfer.data = new ArrayBuffer(1);
 
       usb.interruptTransfer(device, transfer, function (result) {
+        chrome.test.assertNoLastError();
         chrome.test.succeed();
       });
     });
@@ -62,6 +65,7 @@ var tests = [
       isoTransfer.packetLength = 1;
 
       usb.isochronousTransfer(device, isoTransfer, function (result) {
+        chrome.test.assertNoLastError();
         chrome.test.succeed();
       });
     });