Ensure the NavigationHandle's nav entry ID is updated during transfers.

content/browser/frame_host/navigation_controller_impl.h

Index: content/browser/frame_host/navigation_controller_impl.h
diff --git a/content/browser/frame_host/navigation_controller_impl.h b/content/browser/frame_host/navigation_controller_impl.h
index deb6db483e4f6f200801220237bbe60dc0f322f3..9b0e6dcb5bf434b4896d719c916afb1d473f8fc3 100644
--- a/content/browser/frame_host/navigation_controller_impl.h
+++ b/content/browser/frame_host/navigation_controller_impl.h
@@ -258,6 +258,10 @@ class CONTENT_EXPORT NavigationControllerImpl
                             FrameLoadVector* sameDocumentLoads,
                             FrameLoadVector* differentDocumentLoads);
 
+  // Returns whether there is a pending NavigationEntry whose unique ID matches
+  // the given NavigationHandle's pending_nav_entry_id.
+  bool PendingEntryMatchesHandle(NavigationHandleImpl* handle) const;
+
   // Classifies the given renderer navigation (see the NavigationType enum).
   NavigationType ClassifyNavigation(
       RenderFrameHostImpl* rfh,