Fix WebBluetooth generator to distinguish between different methods.

third_party/WebKit/LayoutTests/bluetooth/script-tests/service-get-different-service-after-reconnection.js

-'use strict';
-promise_test(() => {
-  return setBluetoothFakeAdapter('TwoHeartRateServicesAdapter')
-    .then(() => requestDeviceWithKeyDown({
-      filters: [{services: ['heart_rate']}],
-      optionalServices: ['generic_access']}))
-    .then(device => device.gatt.connect())
-    .then(gattServer => {
-      let services1;
-      return gattServer
-        .CALLS([
-          getPrimaryService('heart_rate')|
-          getPrimaryServices()|
-          getPrimaryServices('heart_rate')[UUID]])
-        .then(services => services1 = services)
-        .then(() => gattServer.disconnect())
-        .then(() => gattServer.connect())
-        .then(() => gattServer.PREVIOUS_CALL)
-        .then(services2 => [services1, services2])
-    })
-    .then(services_arrays => {
-      // Convert to arrays if necessary.
-      for (let i = 0; i < services_arrays.length; i++) {
-        services_arrays[i] = [].concat(services_arrays[i]);
-      }
-
-      for (let i = 1; i < services_arrays.length; i++) {
-        assert_equals(services_arrays[0].length, services_arrays[i].length);
-      }
-
-      let base_set = new Set(services_arrays.shift());
-      for (let services of services_arrays) {
-        services.forEach(service => assert_false(base_set.has(service)));
-      }
-    });
-}, 'Calls to FUNCTION_NAME after a disconnection should return a ' +
-   'different object.');