persistentStorage property

DeprecatedStorageQuota persistentStorage
@DocsEditable(), @DomName('Navigator.webkitPersistentStorage'), @Experimental(), @JSName('webkitPersistentStorage'), @SupportedBrowser(SupportedBrowser.CHROME), @SupportedBrowser(SupportedBrowser.SAFARI), final

Implementation 

final DeprecatedStorageQuota persistentStorage