Migrate WebUSB LayoutTests into external/wpt

third_party/WebKit/LayoutTests/usb/resources/webusb-test.js

Index: third_party/WebKit/LayoutTests/usb/resources/webusb-test.js
diff --git a/third_party/WebKit/LayoutTests/usb/resources/webusb-test.js b/third_party/WebKit/LayoutTests/usb/resources/webusb-test.js
deleted file mode 100644
index 42a9495c491201b26ecc85adf7be446d4ab0f792..0000000000000000000000000000000000000000
--- a/third_party/WebKit/LayoutTests/usb/resources/webusb-test.js
+++ /dev/null
@@ -1,13 +0,0 @@
-'use strict';
-
-(() => {
-  let dependencies = [
-    "file:///gen/layout_test_data/mojo/public/js/mojo_bindings.js",
-    "file:///gen/device/usb/public/interfaces/device.mojom.js",
-    "file:///gen/device/usb/public/interfaces/device_manager.mojom.js",
-    "file:///gen/device/usb/public/interfaces/chooser_service.mojom.js",
-    "resources/webusb-test-impl.js",
-  ];
-  for (let dep of dependencies)
-    document.write("<script src='" + dep + "'></script>");
-})();