[Sync] USS: Filter out tombstones for initial sync.

components/sync/engine_impl/test_entry_factory.h

Index: components/sync/engine_impl/test_entry_factory.h
diff --git a/components/sync/engine_impl/test_entry_factory.h b/components/sync/engine_impl/test_entry_factory.h
index 34fe4e987381b458a1d77de51fa6bc504ab1e6de..e8109f996fa00839509bcd6c09745b2ad4a286ba 100644
--- a/components/sync/engine_impl/test_entry_factory.h
+++ b/components/sync/engine_impl/test_entry_factory.h
@@ -57,7 +57,7 @@ class TestEntryFactory {
   // the metahandle of the created item.
   int64_t CreateUnappliedAndUnsyncedBookmarkItem(const std::string& name);
 
-  // Creates a unique_client_tag item that has neither IS_UNSYNED or
+  // Creates a unique_client_tag item that has neither IS_UNSYNCED or
   // IS_UNAPPLIED_UPDATE. The item is known to both the server and client.
   // Returns the metahandle of the created item. |specifics| is optional.
   int64_t CreateSyncedItem(const std::string& name,
@@ -68,6 +68,9 @@ class TestEntryFactory {
                            bool is_folder,
                            const sync_pb::EntitySpecifics& specifics);
 
+  // Create a tombstone for |name|; returns the metahandle of the entry.
+  int64_t CreateTombstone(const std::string& name, ModelType model_type);
+
   // Creates a root node for |model_type|.
   int64_t CreateTypeRootNode(ModelType model_type);