Revert of Use external ID to match native model nodes during bookmark association.

chrome/browser/sync/glue/bookmark_model_associator.h

Index: chrome/browser/sync/glue/bookmark_model_associator.h
diff --git a/chrome/browser/sync/glue/bookmark_model_associator.h b/chrome/browser/sync/glue/bookmark_model_associator.h
index aecdcbf20b7fa662111dba323ea646aa99ba797a..ad1ff71b43c3eacb0dbdf81ec2fb131ba51210b0 100644
--- a/chrome/browser/sync/glue/bookmark_model_associator.h
+++ b/chrome/browser/sync/glue/bookmark_model_associator.h
@@ -140,6 +140,10 @@
       const bookmarks::BookmarkNode* permanent_node,
       const std::string& tag) WARN_UNUSED_RESULT;
 
+  // Compare the properties of a pair of nodes from either domain.
+  bool NodesMatch(const bookmarks::BookmarkNode* bookmark,
+                  const syncer::BaseNode* sync_node) const;
+
   // Check whether bookmark model and sync model are synced by comparing
   // their transaction versions.
   // Returns a PERSISTENCE_ERROR if a transaction mismatch was detected where