The only time we ever need to update a manifest value is when
we update the expiration time. To make it easier to support
updating expiration time across different version, only allow
that one value to be updated.
Change-Id: I621ec744019802edc65b059baa7f5cf0c476b0b1
Made a copy of the storage cell tests for indexeddb but made them
work for the memory storage cell so show that we can expect the
same behavior from them.
This is to give us an extra level of confidence when we use the
memory storage cells in place of the indexeddb storage cells in
our tests.
Issue: #1248
Change-Id: I96eaf57a9d808b4c7e07f97ac2713318a889fc24