Revert "Disable eval from webviews."

This reverts commit f46631a6fb.

This fixes #76 and #79.

Apparently some sites, in this case FB Messenger and Outlook 365,
blindly use `eval` and aren't responsive to fixes. If this causes
security problems down the road, please don't blame me. :)

resources/js/rambox-service-api.js

@@ -65,11 +65,3 @@ Notification.permission = NativeNotification.permission;
 Notification.requestPermission = NativeNotification.requestPermission.bind(Notification);
 
 window.close = function() { location.href = location.origin };
-
-/**
- * Disable eval for security reasons.
- */
-  // eslint-disable-next-line no-eval
-  window.eval = global.eval = function () {
-    throw new Error(`Sorry, this app does not support window.eval().`);
-  };