Chrome keychain
Do not remember my keychain password
Earlier Mac models
Question marked as
Your Keychain password is normally set to your Mac's login password. Please refer to If you need to update your keychain password on Mac - Apple Support.
Excerpt:
"If your user password was reset because you forgot your password, and you can’t provide the old password for the keychain, you won’t be able to access the information in the old keychain, and a new blank keychain is created."