A partir da versão 45, o Chrome não usa mais o gerenciador do OSX Keychain . Pode migrar senhas do Keychain para seu próprio gerenciador de senhas.
You can go to chrome://version/ and find a path to the profile. In the directory there is a 'Preferences'. Find 'keychain_migration' preference. The value can be one of
// Migration wasn't tried yet. NOT_STARTED = 0, // Migration finished successfully. MIGRATED = 1, // Migration failed once. It should be tried again. FAILED_ONCE = 2, // Migration failed twice. It should not be tried again. FAILED_TWICE = 3,
From 2 or 3 you can set it to 0 and restart the browser to try again.
Fonte: Comentário 45