Root domain icons are no more associated with their pages, BUT if the page uses
a root domain icon from another domain, it should still get an association with it
or we couldn't relate the two.
This also fixes an overlooked problem in PlacesTestUtils where Date objects
cross a boundary and fail instanceof checks. This causes failures in the same
test that this patch is modifying.
To protect from future similar issues some protection has been added to updatedPlaces
so that it will crash in debug builds.
MozReview-Commit-ID: 3MTKhGj3ehj