[giow] (1) Disabled port message queues shouldn't have their messages dispatched when they're still unshipped, nor should they stall the entire message queueing mechanism.
Affected topics: DOM APIs

git-svn-id: http://svn.whatwg.org/webapps@8153 340c8d12-0b0e-0410-8428-c7bf67bfef74