Remove dependency on server generated type root folders

sync/internal_api/public/base/model_type.h

Index: sync/internal_api/public/base/model_type.h
diff --git a/sync/internal_api/public/base/model_type.h b/sync/internal_api/public/base/model_type.h
index 8bca7ca7a986b6f5016b17c32cef87fd7dce3116..e86814ca15de2e6f20503af35754c7d0106cd982 100644
--- a/sync/internal_api/public/base/model_type.h
+++ b/sync/internal_api/public/base/model_type.h
@@ -324,6 +324,10 @@ SYNC_EXPORT bool IsProxyType(ModelType model_type);
 // TODO(haitaol): Make entries of act-once data types immutable.
 SYNC_EXPORT bool IsActOnceDataType(ModelType model_type);
 
+// Returns true if |model_type| requires its root folder to be explicitly
+// created on the server during initial sync.
+SYNC_EXPORT bool IsTypeWithServerGeneratedRoot(ModelType model_type);
+
 // Returns set of model types that should be backed up before first sync.
 SYNC_EXPORT ModelTypeSet BackupTypes();