Remove Stack-only www shim code (#10019)

scripts/rollup/shims/facebook-www/ReactFiberErrorLogger.js

@@ -15,13 +15,5 @@ const {
   __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
 } = require('ReactDOM-fb');
 
-// TODO: remove this when we delete Stack
-const ReactFiberErrorLoggerStackShim = {
-  injection: {
-    injectDialog() {},
-  },
-};
-
 module.exports =
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.ReactFiberErrorLogger ||
-  ReactFiberErrorLoggerStackShim;
+  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.ReactFiberErrorLogger;

scripts/rollup/shims/facebook-www/ReactPerf.js

@@ -1,39 +0,0 @@
-/**
- * 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 ReactPerf
- */
-
-'use strict';
-
-const emptyFunction = require('fbjs/lib/emptyFunction');
-const {
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
-} = require('ReactDOM-fb');
-
-// TODO: remove this whole module when we delete Stack
-const ReactPerfFiberShim = {
-  getLastMeasurements: emptyFunction,
-  getExclusive: emptyFunction,
-  getInclusive: emptyFunction,
-  getWasted: emptyFunction,
-  getOperations: emptyFunction,
-  printExclusive: emptyFunction,
-  printInclusive: emptyFunction,
-  printWasted: emptyFunction,
-  printOperations: emptyFunction,
-  start: emptyFunction,
-  stop: emptyFunction,
-  isRunning: emptyFunction,
-  printDOM: emptyFunction,
-  getMeasurementsSummaryMap: emptyFunction,
-};
-
-module.exports =
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.ReactPerf ||
-  ReactPerfFiberShim;