Add [SecureContext] to additional WebUSB interfaces

This change updates the WebUSB WebIDL files to match the recently merged
spec pull request #142 by hiding interfaces which aren't useful in
insecure contexts.

Change-Id: I98625b2634e452c775601525300672d9440ddbcc

webusb/insecure-context.any.js

@@ -0,0 +1,21 @@
+// META: global=sharedworker
+'use strict';
+
+test(() => {
+  assert_false('usb' in navigator);
+  assert_false('USB' in this);
+  assert_false('USBAlternateInterface' in this);
+  assert_false('USBConfiguration' in this);
+  assert_false('USBConnectionEvent' in this);
+  assert_false('USBDevice' in this);
+  assert_false('USBEndpoint' in this);
+  assert_false('USBInterface' in this);
+  assert_false('USBInTransferResult' in this);
+  assert_false('USBOutTransferResult' in this);
+  assert_false('USBIsochronousInTransferResult' in this);
+  assert_false('USBIsochronousOutTransferResult' in this);
+  assert_false('USBIsochronousInTransferPacket' in this);
+  assert_false('USBIsochronousOutTransferPacket' in this);
+}, 'WebUSB is not available in an insecure context');
+
+done();