Remove extra WKWebView file not used

[Titozzz]

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

Test Plan:

This file was never used

Release Notes:

Not necessary

[IOS] [MINOR] [WEBVIEW] - Removed extra WKWebView JS file

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[facebook-github-bot]

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[facebook-github-bot]

hramos is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

@Titozzz merged commit ea124a0 into facebook:master.

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Once this commit is added to a release, you will see the corresponding version tag below the description at ea124a0. If the commit has a single master tag, it is not yet part of a release.