Bug 1226386: Fix call to Utils.catch to pass the correct this and to give the correct this to AddonWrapper.uninstall(). r=gps

--HG--
extra : commitid : FWuxWijkzHE
extra : rebase_source : bef5ded49e3fe6ea44c6f1539dca7f4be6dcbfcf

services/sync/modules/engines/addons.js

@@ -475,7 +475,7 @@ AddonsStore.prototype = {
       }
 
       this._log.info("Uninstalling add-on as part of wipe: " + addon.id);
-      Utils.catch(addon.uninstall)();
+      Utils.catch.call(this, () => addon.uninstall())();
     }
   },