This is not needed, because key is set only if we have a key set for us
which means it was either shared with us, or we have a reason to have a
key (maybe changed the password).
(Kept the fixme that was added in that commit)
This reverts commit 3408e16013.
This is extremely useful for iOS devices where a PWA's session storage
is deleted every time it's minimised, and it's also useful for people
having multiple tabs open.
Tom Hacohen