Please consider this function:
  static std::unique_ptr<NavigationHandleImpl> Create(
      const GURL& url,
      const std::vector<GURL>& redirect_chain,
      FrameTreeNode* frame_tree_node,
      bool is_renderer_initiated,
      bool is_same_page,
      const base::TimeTicks& navigation_start,
      int pending_nav_entry_id,
      bool started_from_context_menu,
      CSPDisposition should_check_main_world_csp,
      bool is_form_submission);

It begins to have too many booleans on this method. It might be useful to convert them to enums, so they are more meaningful when reading the callers of this method.