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
var ReactFiberScheduler = require('ReactFiberScheduler');
var {HostComponent} = require('ReactTypeOfWork');
if (__DEV__) {
  var warning = require('fbjs/lib/warning');
  var ReactFiberInstrumentation = require('ReactFiberInstrumentation');
  var ReactDebugCurrentFiber = require('ReactDebugCurrentFiber');
  var getComponentName = require('getComponentName');
}
var {
  findCurrentHostFiber,
  findCurrentHostFiberWithNoPortals,
} = require('ReactFiberTreeReflection');
var getContextForSubtree = require('getContextForSubtree');
export type Deadline = {
  timeRemaining: () => number,
};
type OpaqueHandle = Fiber;
type OpaqueRoot = FiberRoot;
export type HostConfig<T, P, I, TI, PI, C, CX, PL> = {
  getRootHostContext(rootContainerInstance: C): CX,
  getChildHostContext(parentHostContext: CX, type: T, instance: C): CX,
  getPublicInstance(instance: I | TI): PI,
  createInstance(
    type: T,
    props: P,
    rootContainerInstance: C,
    hostContext: CX,
    internalInstanceHandle: OpaqueHandle,
  ): I,
  appendInitialChild(parentInstance: I, child: I | TI): void,