Switch from the old XML-based AMO metadata API to the modern JSON based
API. This turned into something between a modest update and complete
rewrite. Most notably, external APIs became (mostly) promise-based. The
exception is getCachedAddonById() which XPIInstall.jsm requires a
synchronous callback from.
Also, hopefully we will be able to get rid of a bunch of this metadata
handling soon. If this code had a long life ahead of it, the unit tests
could use some more attention, but I mostly did the minimum here just to
keep them running for now with the expectation that we'll be able to get
rid of them within some small number of months.
MozReview-Commit-ID: 3DRaBdWGaiJ
--HG--
rename : services/sync/tests/unit/addon1-search.xml => services/sync/tests/unit/addon1-search.json
rename : services/sync/tests/unit/bootstrap1-search.xml => services/sync/tests/unit/bootstrap1-search.json
rename : services/sync/tests/unit/missing-sourceuri.xml => services/sync/tests/unit/missing-sourceuri.json
rename : services/sync/tests/unit/missing-xpi-search.xml => services/sync/tests/unit/missing-xpi-search.json
rename : services/sync/tests/unit/rewrite-search.xml => services/sync/tests/unit/rewrite-search.json
rename : services/sync/tests/unit/systemaddon-search.xml => services/sync/tests/unit/systemaddon-search.json
extra : rebase_source : f25d78b938768041c5c05b72a1f7ff3a7dee8275
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aeee120808