Fix WebBluetooth generator to distinguish between different methods.

third_party/WebKit/LayoutTests/bluetooth/script-tests/service-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 => {
-      promise = assert_promise_rejects_with_message(
-        gattServer.CALLS([
-          getPrimaryService('health_thermometer')|
-          getPrimaryServices()|
-          getPrimaryServices('health_thermometer')[UUID]]),
-        new DOMException(
-          'GATT Server disconnected while retrieving services.',
-          'NetworkError'));
-      gattServer.disconnect();
-    })
-    .then(runGarbageCollection)
-    .then(() => promise);
-}, 'Garbage Collection ran during a FUNCTION_NAME call that succeeds. ' +
-   'Should not crash.');