Ensure FrameNavigationEntry is fully updated.

content/browser/frame_host/navigation_entry_impl.h

Index: content/browser/frame_host/navigation_entry_impl.h
diff --git a/content/browser/frame_host/navigation_entry_impl.h b/content/browser/frame_host/navigation_entry_impl.h
index e76f391ad6cceff250cf72f4c7f2e3ccc6d2675b..04162896b4793be53730fc0817eeb24e33b95314 100644
--- a/content/browser/frame_host/navigation_entry_impl.h
+++ b/content/browser/frame_host/navigation_entry_impl.h
@@ -227,11 +227,6 @@ class CONTENT_EXPORT NavigationEntryImpl
   // there is one in this NavigationEntry.
   FrameNavigationEntry* GetFrameEntry(FrameTreeNode* frame_tree_node) const;
 
-  // Removes subframe FrameNavigationEntries below the item corresponding to
-  // |frame_tree_node| (if any).  This is necessary after server redirects
-  // during session history navigations, when the child items no longer apply.
-  void ClearChildren(FrameTreeNode* frame_tree_node);
-
   // Removes any subframe FrameNavigationEntries that match the unique name of
   // |frame_tree_node|, and all of their children. There should be at most one,
   // since collisions are avoided but leave old FrameNavigationEntries in the