LGTM.com - false positive - js/unvalidated-message-origin wrongly detects window.chrome.webview.addEventListener('message' ...

**Description of the false positive**

Microsoft's webview2 provides a `window.chrome.webview` object which supports a "message" event for receiving messages from the host application. This is not the same as the `window` "message" event, and the event object doesn't support an `origin` property, but js/unvalidated-message-origin wrongly flags it.

**URL to the alert on the project page on LGTM.com**

This alert is not in a project that's on LGTM.com.