The upgrade migration tests in this patch fail after the changes in part 1.
This appears to be because they attempt to perform migrations on the
moz-safe-about+home origin scheme in the profile directory, which no longer
parses as an origin.
This patch updates quota/OriginParser to treat all moz-safe-about origins as
"obsolete". I believe that this should be safe to do now, as the changes in the
previous part block the creation of moz-safe-about: principals. In specific,
the moz-safe-about:home origin appears to have not been used for 8 years since
bug 1438367.
In addition to the parser & test changes, some other references to
moz-safe-about:home have also been removed.
Differential Revision: https://phabricator.services.mozilla.com/D303179
Nika Layzell
7c225f929e