Remove extra WKWebView file not used (#21182)

Summary:
This file was created recently but is not used as the WKWebview was integrated directly into the Webview.ios.js

Removing this file to clarify the situation
Pull Request resolved: https://github.com/facebook/react-native/pull/21182

Differential Revision: D9942905

Pulled By: hramos

fbshipit-source-id: 19e9fba94280428edd1deab4a54f8c5dc42a6bfa

Libraries/Components/WKWebView/WKWebView.ios.js

@@ -1,42 +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
- * @providesModule WKWebView
- */
-
-const React = require('react');
-
-const requireNativeComponent = require('requireNativeComponent');
-
-const RCTWKWebView = requireNativeComponent('RCTWKWebView');
-
-type RCTWKWebViewProps = {
-  allowsInlineMediaPlayback?: boolean,
-  mediaPlaybackRequiresUserAction?: boolean,
-  dataDetectorTypes?: boolean,
-};
-
-class WKWebView extends React.Component<RCTWKWebViewProps> {
-  componentWillReceiveProps(nextProps: RCTWKWebViewProps) {
-    this.showRedboxOnPropChanges(nextProps, 'allowsInlineMediaPlayback');
-    this.showRedboxOnPropChanges(nextProps, 'mediaPlaybackRequiresUserAction');
-    this.showRedboxOnPropChanges(nextProps, 'dataDetectorTypes');
-  }
-
-  showRedboxOnPropChanges(nextProps: RCTWKWebViewProps, propName: string) {
-    if (this.props[propName] !== nextProps[propName]) {
-      console.error(`Changes to property ${propName} do nothing after the initial render.`);
-    }
-  }
-
-  render() {
-    return <RCTWKWebView {...this.props}/>;
-  }
-}
-
-module.exports = WKWebView;