Bug 921453.  Don't allow conditional-exposure annotations on an interface that has no interface object, since they make no sense there.  r=khuey
Bug 908390 part 1.  Make [Exposed] work correctly on jsonifiers and stringifiers and don't create an unforgeable toJSON just because we have a jsonifier.  r=khuey
Bug 908390 part 2.  Implement performance.now() on workers.  r=khuey

--HG--
rename : dom/workers/test/test_worker_interfaces.html => dom/workers/test/test_worker_performance_now.html
rename : dom/tests/mochitest/general/test_performance_now.html => dom/workers/test/test_worker_performance_now.js