test_acceptance_as3_Workers_* fails randomly

[mrchnk]

Problems with those:

• WorkerCreateMax.as
• ByteArrayWorkers.as
• RemoteCall.as

Also found some Worker tests marked with expectedfail in tamarin failconfig.txt

More info about that
https://bugzilla.mozilla.org/show_bug.cgi?id=774332

OS: macos, windows, ubuntu

[mrchnk]

Same but more seldom on MacOS

[mrchnk]

And Windows too