Fix headless_browsertests failures with PlzNavigate.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index 069f5b5d1fb9e89f780a74048084610515efd789..272f70a062765c466f13294bafee47eb61c4db74 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -2714,6 +2714,9 @@ void RenderFrameHostImpl::FailedNavigation(
   Send(new FrameMsg_FailedNavigation(routing_id_, common_params, request_params,
                                      has_stale_copy_in_cache, error_code));
 
+  RenderFrameDevToolsAgentHost::OnFailedNavigation(
+      this, static_cast<net::Error>(error_code));
+
   // An error page is expected to commit, hence why is_loading_ is set to true.
   is_loading_ = true;
   frame_tree_node_->ResetNavigationRequest(true);