PlzNavigate: move ownership of the NavigationRequest to the FrameTreeNode

content/test/test_render_frame_host.cc

Index: content/test/test_render_frame_host.cc
diff --git a/content/test/test_render_frame_host.cc b/content/test/test_render_frame_host.cc
index 93bc602599602e5a8ce517628c914dc2b1c966c9..cdd3e78f8e0878c172bda127c2dd705cc309404e 100644
--- a/content/test/test_render_frame_host.cc
+++ b/content/test/test_render_frame_host.cc
@@ -234,9 +234,7 @@ void TestRenderFrameHost::PrepareForCommitWithServerRedirect(
   }
 
   // PlzNavigate
-  NavigationRequest* request =
-      static_cast<NavigatorImpl*>(frame_tree_node_->navigator())
-          ->GetNavigationRequestForNodeForTesting(frame_tree_node_);
+  NavigationRequest* request = frame_tree_node_->navigation_request();
   CHECK(request);
 
   // Simulate a beforeUnload ACK from the renderer if the browser is waiting for