Revert "Fix ref type for Native Scroll View"

This reverts commit db662af5b2.

Libraries/Components/ScrollView/ScrollView.js

@@ -37,7 +37,6 @@ import type {
   ScrollEvent,
   LayoutEvent,
 } from '../../Types/CoreEventTypes';
-import type {HostComponent} from '../../Renderer/shims/ReactNativeTypes';
 import type {State as ScrollResponderState} from '../ScrollResponder';
 import type {ViewProps} from '../View/ViewPropTypes';
 import type {Props as ScrollViewStickyHeaderProps} from './ScrollViewStickyHeader';
@@ -770,11 +769,15 @@ class ScrollView extends React.Component<Props, State> {
     return ReactNative.findNodeHandle(this._innerViewRef);
   }
 
-  getInnerViewRef(): ?React.ElementRef<HostComponent<mixed>> {
+  getInnerViewRef(): ?React.ElementRef<
+    Class<ReactNative.NativeComponent<mixed>>,
+  > {
     return this._innerViewRef;
   }
 
-  getNativeScrollRef(): ?React.ElementRef<HostComponent<mixed>> {
+  getNativeScrollRef(): ?React.ElementRef<
+    Class<ReactNative.NativeComponent<mixed>>,
+  > {
     return this._scrollViewRef;
   }
 
@@ -947,13 +950,21 @@ class ScrollView extends React.Component<Props, State> {
       this.props.onContentSizeChange(width, height);
   };
 
-  _scrollViewRef: ?React.ElementRef<HostComponent<mixed>> = null;
-  _setScrollViewRef = (ref: ?React.ElementRef<HostComponent<mixed>>) => {
+  _scrollViewRef: ?React.ElementRef<
+    Class<ReactNative.NativeComponent<mixed>>,
+  > = null;
+  _setScrollViewRef = (
+    ref: ?React.ElementRef<Class<ReactNative.NativeComponent<mixed>>>,
+  ) => {
     this._scrollViewRef = ref;
   };
 
-  _innerViewRef: ?React.ElementRef<HostComponent<mixed>> = null;
-  _setInnerViewRef = (ref: ?React.ElementRef<HostComponent<mixed>>) => {
+  _innerViewRef: ?React.ElementRef<
+    Class<ReactNative.NativeComponent<mixed>>,
+  > = null;
+  _setInnerViewRef = (
+    ref: ?React.ElementRef<Class<ReactNative.NativeComponent<mixed>>>,
+  ) => {
     this._innerViewRef = ref;
   };
 
@@ -1057,6 +1068,7 @@ class ScrollView extends React.Component<Props, State> {
     const contentContainer = (
       <ScrollContentContainerViewClass
         {...contentSizeChangeProps}
+        // $FlowFixMe Invalid prop usage
         ref={this._setInnerViewRef}
         style={contentContainerStyle}
         removeClippedSubviews={
@@ -1166,6 +1178,7 @@ class ScrollView extends React.Component<Props, State> {
         // On iOS the RefreshControl is a child of the ScrollView.
         // tvOS lacks native support for RefreshControl, so don't include it in that case
         return (
+          // $FlowFixMe
           <ScrollViewClass {...props} ref={this._setScrollViewRef}>
             {Platform.isTV ? null : refreshControl}
             {contentContainer}
@@ -1184,6 +1197,7 @@ class ScrollView extends React.Component<Props, State> {
           <ScrollViewClass
             {...props}
             style={[baseStyle, inner]}
+            // $FlowFixMe
             ref={this._setScrollViewRef}>
             {contentContainer}
           </ScrollViewClass>,
@@ -1191,6 +1205,7 @@ class ScrollView extends React.Component<Props, State> {
       }
     }
     return (
+      // $FlowFixMe
       <ScrollViewClass {...props} ref={this._setScrollViewRef}>
         {contentContainer}
       </ScrollViewClass>