Create NavigationHandle after beforeunload with PlzNavigate.

content/browser/frame_host/navigator_impl.h

Index: content/browser/frame_host/navigator_impl.h
diff --git a/content/browser/frame_host/navigator_impl.h b/content/browser/frame_host/navigator_impl.h
index 77ed79ef878ede9a2af58bf307d6fc0930223065..648e209db1b7a35d1293b8282ec34a3a6b6020ec 100644
--- a/content/browser/frame_host/navigator_impl.h
+++ b/content/browser/frame_host/navigator_impl.h
@@ -85,7 +85,9 @@ class CONTENT_EXPORT NavigatorImpl : public Navigator {
                           const std::string& method,
                           scoped_refptr<ResourceRequestBodyImpl> post_body,
                           const std::string& extra_headers) override;
-  void OnBeforeUnloadACK(FrameTreeNode* frame_tree_node, bool proceed) override;
+  void OnBeforeUnloadACK(FrameTreeNode* frame_tree_node,
+                         bool proceed,
+                         const base::TimeTicks& proceed_time) override;
   void OnBeginNavigation(FrameTreeNode* frame_tree_node,
                          const CommonNavigationParams& common_params,
                          const BeginNavigationParams& begin_params) override;
@@ -97,7 +99,7 @@ class CONTENT_EXPORT NavigatorImpl : public Navigator {
       const base::TimeTicks& renderer_before_unload_end_time) override;
   void CancelNavigation(FrameTreeNode* frame_tree_node,
                         bool inform_renderer) override;
-  void DiscardPendingEntryIfNeeded(NavigationHandleImpl* handle) override;
+  void DiscardPendingEntryIfNeeded(int expected_pending_entry_id) override;
 
  private:
   // Holds data used to track browser side navigation metrics.