PlzNavigate: remove NavigatorImpl::FailedNavigation

content/browser/frame_host/navigator.h

Index: content/browser/frame_host/navigator.h
diff --git a/content/browser/frame_host/navigator.h b/content/browser/frame_host/navigator.h
index d322c017047639f60c01360630f2f8e1d49a6221..5f0a059a79ce0a2c4f7b3e8337b040dc5f32baed 100644
--- a/content/browser/frame_host/navigator.h
+++ b/content/browser/frame_host/navigator.h
@@ -157,15 +157,6 @@ class CONTENT_EXPORT Navigator : public base::RefCounted<Navigator> {
                                  const BeginNavigationParams& begin_params);
 
   // PlzNavigate
-  // Called when a NavigationRequest for |frame_tree_node| failed. An
-  // appropriate RenderFrameHost should be selected and asked to show an error
-  // page. |has_stale_copy_in_cache| is true if there is a stale copy of the
-  // unreachable page in cache.
-  virtual void FailedNavigation(FrameTreeNode* frame_tree_node,
-                                bool has_stale_copy_in_cache,
-                                int error_code) {}
-
-  // PlzNavigate
   // Cancel a NavigationRequest for |frame_tree_node|. Called when
   // |frame_tree_node| is destroyed.
   virtual void CancelNavigation(FrameTreeNode* frame_tree_node) {}