Google Maps and PDF reader API throws UnSupported URL error when Migrating from UIWebView To WKWebView

Since Apple deprecated UIWebView and supports WKWebView, we updated the iOS version to 6.0.0 and removed **cordova-plugin-wkwebview-engine** plugin that was no longer supported.

After the iOS upgrade google map and pdf API calls stopped working and throws **unsupported URL error**.

We are using **cordova-plugin-inappbrowser 4.0.0** to call Google Map and PDF reader APIs. Below is the code snippet of InAppBrowser to call google Map URL.

```
$scope.openMap = function(url) {
options='location=no,toolbar=yes';
cordova.InAppBrowser.open(url, '_blank', options);
return false;
}
```
[Unsupported URL Error for Google Maps][1]
Below are the plugins installed and platform details:

Installed platforms:
```

ios 6.0.0
```
[Plugin details][2]

[1]: https://i.stack.imgur.com/hqdN4.png
[2]: https://i.stack.imgur.com/2i1en.png

stack overflow-link https://stackoverflow.com/questions/63308013/google-maps-and-pdf-reader-api-throws-unsupported-url-error-when-migrating-from

Start with the cordova.InAppBrowser.open(url, '_blank', options) call and reproduce the Google Maps and PDF API failures on the listed ios 6.0.0 platform using the linked examples. Compare the behavior before and after removing cordova-plugin-wkwebview-engine; done means those URLs open without an unsupported URL error.

Written by the indexing model from the issue text.