Backed out changeset 66fd5784afd9 (bug 927560)
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Bug 927560 - Shutdown osfile_async_worker.js, companion tests;r=froydnj
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try: -b o -p emulator,emulator-jb,unagi -u xpcshell -t none
Bug 927560 - Skip test_shutdown.js on all platforms. r=Yoric, a=test-only