FaviconDatabaseError# class FaviconDatabaseError# Enum values used to denote the various errors related to the FaviconDatabase. Methods# class FaviconDatabaseError quark() → int# Gets the quark for the domain of favicon database errors. Fields# class FaviconDatabaseError FAVICON_NOT_FOUND# The type of the None singleton. FAVICON_UNKNOWN# The type of the None singleton. NOT_INITIALIZED# The type of the None singleton.