There doesn't seem to be a way to delete saved passwords from the iCloud Keychain in Yosemite. If I choose Safari>Preferences from the menubar, then click on the Passwords tab in the panel, I see the saved passwords. With previous versions of OS X, I could select a password and delete it (or all of them if I wished). That doesn't seem to work, at least for me, in Yosemite PB4. Anyone else?