[sync] use std::multimap for BookmarkNodeMap

components/sync_bookmarks/bookmark_model_associator.cc

Index: components/sync_bookmarks/bookmark_model_associator.cc
diff --git a/components/sync_bookmarks/bookmark_model_associator.cc b/components/sync_bookmarks/bookmark_model_associator.cc
index 2305bb1fd9b14de368c399124c93495d149d0b43..8376ee04c2c4ba9d389f79063addd2019c57d400 100644
--- a/components/sync_bookmarks/bookmark_model_associator.cc
+++ b/components/sync_bookmarks/bookmark_model_associator.cc
@@ -94,7 +94,7 @@ class BookmarkNodeFinder {
   // Maps bookmark node titles to instances, duplicates allowed.
   // Titles are converted to the sync internal format before
   // being used as keys for the map.
-  using BookmarkNodeMap = base::hash_multimap<std::string, const BookmarkNode*>;
+  using BookmarkNodeMap = std::multimap<std::string, const BookmarkNode*>;
   using BookmarkNodeRange =
       std::pair<BookmarkNodeMap::iterator, BookmarkNodeMap::iterator>;