Fix WebBluetooth generator to distinguish between different methods.

third_party/WebKit/LayoutTests/bluetooth/script-tests/server/garbage-collection-ran-during-error.js

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