Remove usages of listKey

Summary:
Now that the prop noops, remove the usages of the property. This is the point of no return for the prop.

Replaced listKey usage with a combination of `flow check`, regex replace, manual inspection.

Changelog:
[General][Removed] - Remove usages of listKey

Reviewed By: fred2028

Differential Revision: D39589089

fbshipit-source-id: 722ebb7dce038a2709656394b7d736e72f488bb7

Libraries/Lists/VirtualizedListProps.js

@@ -163,14 +163,6 @@ type OptionalProps = {|
    * Styling for internal View for ListHeaderComponent
    */
   ListHeaderComponentStyle?: ViewStyleProp,
-  /**
-   * A unique identifier for this list. If there are multiple VirtualizedLists at the same level of
-   * nesting within another VirtualizedList, this key is necessary for virtualization to
-   * work properly.
-   *
-   * @deprecated no longer used/required
-   */
-  listKey?: string,
   /**
    * The maximum number of items to render in each incremental render batch. The more rendered at
    * once, the better the fill rate, but responsiveness may suffer because rendering content may

packages/rn-tester/js/examples/FlatList/FlatList-nested.js

@@ -187,7 +187,6 @@ function OuterItemRenderer({
           <View style={styles.col}>
             <FlatList
               data={items.map(i => index * items.length * 3 + i)}
-              listKey={`${index}-col1`}
               renderItem={p => (
                 <InnerItemRenderer
                   item={p.item}
@@ -203,7 +202,6 @@ function OuterItemRenderer({
           <View style={styles.col}>
             <FlatList
               data={items.map(i => index * items.length * 3 + i + items.length)}
-              listKey={`${index}-col2`}
               renderItem={p => (
                 <InnerItemRenderer
                   item={p.item}