Fix WebBluetooth generator to distinguish between different methods.

third_party/WebKit/LayoutTests/bluetooth/script-tests/service-disconnect-invalidates-objects.js

-'use strict';
-promise_test(() => {
-  let promise;
-  return setBluetoothFakeAdapter('TwoHeartRateServicesAdapter')
-    .then(() => requestDeviceWithKeyDown({
-      filters: [{services: ['heart_rate']}]}))
-    .then(device => device.gatt.connect())
-    .then(gattServer => {
-      return gattServer
-        .CALLS([
-          getPrimaryService('heart_rate')|
-          getPrimaryServices()|
-          getPrimaryServices('heart_rate')[UUID]])
-        // Convert to array if necessary.
-        .then(s => {
-          let services = [].concat(s);
-          gattServer.disconnect();
-          return gattServer.connect()
-            .then(() => services);
-        });
-    })
-    .then(services => {
-      let promises = Promise.resolve();
-      for (let service of services) {
-        let error = new DOMException(
-          'Service is no longer valid. Remember to retrieve the service ' +
-          'again after reconnecting.',
-          'InvalidStateError');
-        promises = promises.then(() =>
-          assert_promise_rejects_with_message(
-            service.getCharacteristic('body_sensor_location'),
-            error));
-        promises = promises.then(() =>
-          assert_promise_rejects_with_message(
-            service.getCharacteristics(),
-            error));
-        promises = promises.then(() =>
-          assert_promise_rejects_with_message(
-            service.getCharacteristics('body_sensor_location'),
-            error));
-      }
-      return promises;
-    });
-}, 'Calls on services after we disconnect and connect again. '+
-   'Should reject with InvalidStateError.');