bluetooth: Require frame to be connected for writValue to succeed.

third_party/WebKit/LayoutTests/resources/bluetooth/bluetooth-helpers.js

Index: third_party/WebKit/LayoutTests/resources/bluetooth/bluetooth-helpers.js
diff --git a/third_party/WebKit/LayoutTests/resources/bluetooth/bluetooth-helpers.js b/third_party/WebKit/LayoutTests/resources/bluetooth/bluetooth-helpers.js
index 25cd7911ae71e0cd5361909ffb104661d0179ba3..a8e4f8940a6cb0e9a05547eb5876e03341647e9a 100644
--- a/third_party/WebKit/LayoutTests/resources/bluetooth/bluetooth-helpers.js
+++ b/third_party/WebKit/LayoutTests/resources/bluetooth/bluetooth-helpers.js
@@ -324,9 +324,11 @@ function get_request_disconnection(gattServer) {
   return gattServer.getPrimaryService(request_disconnection_service_uuid)
     .then(service => service.getCharacteristic(request_disconnection_characteristic_uuid))
     .then(characteristic => {
-      // TODO(crbug.com/543466): Wrap in assert_promise_rejects_with_message()
-      // once connection is required for writeValue to succeed.
-      return () => characteristic.writeValue(new Uint8Array([0]));
+      return () => assert_promise_rejects_with_message(
+        characteristic.writeValue(new Uint8Array([0])),
+        new DOMException(
+          'GATT Server disconnected while performing a GATT operation.',
+          'NetworkError'));
     });
 }