Send UpdateState when detaching a RenderFrame in FNE-enabled modes.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 621712eba762c597a3c04f315aa8afee9afe1be3..4245a9fe536fa8d9d35b03c5027096c914d1f781 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -2851,6 +2851,10 @@ void RenderFrameImpl::frameDetached(blink::WebLocalFrame* frame,
   FOR_EACH_OBSERVER(RenderViewObserver, render_view_->observers(),
                     FrameDetached(frame));
 
+  // Send a state update before the frame is detached.
+  if (SiteIsolationPolicy::UseSubframeNavigationEntries())
+    SendUpdateState();
+
   // We only notify the browser process when the frame is being detached for
   // removal and it was initiated from the renderer process.
   if (!in_browser_initiated_detach_ && type == DetachType::Remove)