WebUSB: Create a requestDevice method separate from getDevice.

Source/modules/webusb/USBDeviceEnumerationOptions.idl

Index: Source/modules/webusb/USBDeviceEnumerationOptions.idl
diff --git a/Source/modules/webusb/USBDeviceEnumerationOptions.idl b/Source/modules/webusb/USBDeviceEnumerationOptions.idl
deleted file mode 100644
index ec9a3c401e64a120179e69cc351fcc2879f078be..0000000000000000000000000000000000000000
--- a/Source/modules/webusb/USBDeviceEnumerationOptions.idl
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2015 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.
-
-// http://reillyeon.github.io/webusb/#device-enumeration
-
-dictionary USBDeviceEnumerationOptions {
-    required sequence<USBDeviceFilter> filters;
-};