http://searchfox.org/mozilla-central/source/testing/specialpowers/content/specialpowersAPI.js#520 sendAsyncMessage calls _sendSyncMessage This is weird...
Do you know anything about this Alex?
Looks like a typo. It would be worth simply replacing it to _sendAsyncMessage and see if try is still happy with it?
Unfortunately, it looks like dom/presentation/tests/mochitest/test_presentation_1ua_connection_wentaway_inproc.html and dom/presentation/tests/mochitest/test_presentation_1ua_connection_wentaway_oop.html now depends on it to be sync...
Can the dom/presentation case be replaced with a call to sendSyncMessage then, so it's possible to change to _sendAsyncMessage under the covers?
The test still fails locally even when switching it back to sendSyncMessage... but let's see if that please try.
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