Boris Zbarsky 34d8ccc06a Bug 792980. Don't force consumers to list descriptors for interfaces that are using all teh defaults. r=peterv
The new setup is:

* Consequential interfaces with no explicit descriptor are still skipped.
* If no information is provided about an interface, an empty descriptor is
  assumed.
* If a list is provided and the only entry is a worker descriptor, an empty
  main-thread descriptor is assumed.
2012-10-01 08:56:31 -04:00
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