Create NavigationHandles for interstitials if needed

content/browser/frame_host/navigator_impl.cc

Index: content/browser/frame_host/navigator_impl.cc
diff --git a/content/browser/frame_host/navigator_impl.cc b/content/browser/frame_host/navigator_impl.cc
index a25c56910565a66d44516a2022fb1c61b469ef7d..bf7abe9cf2f45df93ee6435b0091557aea2d27b0 100644
--- a/content/browser/frame_host/navigator_impl.cc
+++ b/content/browser/frame_host/navigator_impl.cc
@@ -1004,6 +1004,11 @@ void NavigatorImpl::LogBeforeUnloadTime(
   }
 }
 
+NavigationHandleImpl* NavigatorImpl::GetNavigationHandleForFrameHost(
+    RenderFrameHostImpl* render_frame_host) {
+  return render_frame_host->navigation_handle();
+}
+
 // PlzNavigate
 void NavigatorImpl::RequestNavigation(FrameTreeNode* frame_tree_node,
                                       const GURL& dest_url,