Ship virtualizedlist remeasure fix

Summary:
This diff ships the virtualizedlist remeasure fix implemented in D27003249 (1bc06f18c6)

For more details about experiment see: https://fb.workplace.com/groups/rn.engineering/permalink/2831770330485832/

changelog: [internal] internal

Reviewed By: JoshuaGross

Differential Revision: D28072308

fbshipit-source-id: c23c958ca9f2991236cb5a5c02084722aa6de919

Libraries/Lists/VirtualizedList.js

@@ -20,7 +20,6 @@ const ViewabilityHelper = require('./ViewabilityHelper');
 const flattenStyle = require('../StyleSheet/flattenStyle');
 const infoLog = require('../Utilities/infoLog');
 const invariant = require('invariant');
-import VirtualizedListInjection from './VirtualizedListInjection';
 
 import {
   keyExtractor as defaultKeyExtractor,
@@ -1353,22 +1352,18 @@ class VirtualizedList extends React.PureComponent<Props, State> {
             this._scrollMetrics.visibleLength = scrollMetrics.visibleLength;
             this._scrollMetrics.offset = scrollMetrics.offset;
 
-            if (
-              VirtualizedListInjection?.unstable_enableVirtualizedListRemeasureChildrenIfNeeded
-            ) {
-              // If metrics of the scrollView changed, then we triggered remeasure for child list
-              // to ensure VirtualizedList has the right information.
-              this._cellKeysToChildListKeys.forEach(childListKeys => {
-                if (childListKeys) {
-                  for (let childKey of childListKeys) {
-                    const childList = this._nestedChildLists.get(childKey);
-                    childList &&
-                      childList.ref &&
-                      childList.ref.measureLayoutRelativeToContainingList();
-                  }
+            // If metrics of the scrollView changed, then we triggered remeasure for child list
+            // to ensure VirtualizedList has the right information.
+            this._cellKeysToChildListKeys.forEach(childListKeys => {
+              if (childListKeys) {
+                for (let childKey of childListKeys) {
+                  const childList = this._nestedChildLists.get(childKey);
+                  childList &&
+                    childList.ref &&
+                    childList.ref.measureLayoutRelativeToContainingList();
                 }
-              });
-            }
+              }
+            });
           }
         },
         error => {

Libraries/Lists/VirtualizedListInjection.js

@@ -1,15 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @format
- * @flow
- */
-
-'use strict';
-
-export default {
-  unstable_enableVirtualizedListRemeasureChildrenIfNeeded: (null: ?boolean),
-};