We don't actually use this anywhere, so let's remove it.

https://github.com/facebook/react/blob/f1d00156df5453bc62bd5668fefdcac4ca67e90e/src/renderers/shared/fiber/ReactFiberScheduler.js#L1504-L1512
/**
 * Copyright 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule ReactFiberReconciler
 * @flow
 */
'use strict';
import type {Fiber} from 'ReactFiber';
import type {FiberRoot} from 'ReactFiberRoot';
import type {PriorityLevel} from 'ReactPriorityLevel';
import type {ReactNodeList} from 'ReactTypes';
var ReactFeatureFlags = require('ReactFeatureFlags');
var {addTopLevelUpdate} = require('ReactFiberUpdateQueue');
var {
  findCurrentUnmaskedContext,
  isContextProvider,
  processChildContext,
} = require('ReactFiberContext');
var {createFiberRoot} = require('ReactFiberRoot');