Remove api.WindowEventHandlers.onmessageerror.worker_support from BCD (#13796)
Remove api.WindowEventHandlers.onmessageerror.worker_support from BCD (#13796)

This PR removes the `onmessageerror.worker_support` member of the `WindowEventHandlers` API from BCD.  Worker support is already represented in the dedicated worker global scopes, and it doesn't make sense to have a `worker_support` feature in this context.
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data