Partial React Sync from 241c4467...349ff315b

Summary:
Includes these commits:

- **[349ff315b](facebook/react@349ff315b )**: [Native] Delete NativeComponent and NativeMethodsMixin (#18036) //<Eli White>//

Changelog:
[General][Changed] - React Native sync for revisions 241c4467...349ff315b

Reviewed By: zackargyle

Differential Revision: D19893829

fbshipit-source-id: 77f35d6b7a0ddf375941c3185decf3862b6807a7

Author: elicwhite

Libraries/ReactNative/ReactFabricInternals.js

@@ -10,16 +10,8 @@
 
 'use strict';
 
-const {
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
-} = require('../Renderer/shims/ReactFabric');
 const createReactNativeComponentClass = require('../Renderer/shims/createReactNativeComponentClass');
 
-import type {NativeMethodsMixinType} from '../Renderer/shims/ReactNativeTypes';
-
-const {NativeMethodsMixin} = __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
-
 module.exports = {
-  NativeMethodsMixin: ((NativeMethodsMixin: any): $Exact<NativeMethodsMixinType>),
   createReactNativeComponentClass,
 };