This patch does two things. The first is that it fixes the two tests mentioned in the title by saving a previously registered XULAppInfoFactory, unregistering it, registering the new factory, and then at the end of the test re-registering the factory which was registered before the test started. The second thing this patch does is remove the skipping conditions for these two tests so we can run them on linux64-jsdcov.
MozReview-Commit-ID: 71c1nrYvx1M
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extra : rebase_source : 818fc5e7fff8ff9985e42835928f26fc13387788