Fix WebBluetooth generator to distinguish between different methods.

third_party/WebKit/LayoutTests/bluetooth/script-tests/characteristic-garbage-collection-ran-during-success.js

-'use strict';
-promise_test(() => {
-  let promise;
-  return setBluetoothFakeAdapter('DisconnectingHealthThermometerAdapter')
-    .then(() => requestDeviceWithKeyDown({
-      filters: [{services: ['health_thermometer']}]}))
-    .then(device => device.gatt.connect())
-    .then(gattServer => gattServer.getPrimaryService('health_thermometer'))
-    .then(service => {
-      promise = assert_promise_rejects_with_message(
-        service.CALLS([
-          getCharacteristic('measurement_interval')|
-          getCharacteristics()|
-          getCharacteristics('measurement_interval')[UUID]]),
-        new DOMException(
-          'GATT Server disconnected while retrieving characteristics.',
-          'NetworkError'));
-      // Disconnect called to clear attributeInstanceMap and allow the
-      // object to get garbage collected.
-      service.device.gatt.disconnect();
-    })
-    .then(runGarbageCollection)
-    .then(() => promise);
-}, 'Garbage Collection ran during a FUNCTION_NAME call that succeeds. ' +
-   'Should not crash.');