handle Render Process Gone
fun handleRenderProcessGone(view: WebView?, detail: RenderProcessGoneDetail?, onGracefulTeardown: () -> Unit = {}): Boolean
fun handleRenderProcessGone(view: WebView?, detail: RenderProcessGoneDetail?, onGracefulTeardown: Runnable): Boolean
Java-friendly overload — avoids kotlin.Unit.INSTANCE ceremony at callsites.