misc: remove duplicated declarations

react/features/authentication/components/WaitForOwnerDialog.native.js

@@ -81,8 +81,6 @@ class WaitForOwnerDialog extends Component {
         );
     }
 
-    _onCancel: () => void;
-
     /**
      * Called when the cancel button is clicked.
      *
@@ -93,8 +91,6 @@ class WaitForOwnerDialog extends Component {
         this.props.dispatch(cancelWaitForOwner());
     }
 
-    _onLogin: () => void;
-
     /**
      * Called when the OK button is clicked.
      *