Bug 914937: Remove nsFlexContainerFrame::GetSkipSides, now that we can inherit a useful impl from nsSplittableFrame. r=mats
Bug 915344: Make variables 'SAMPLES' and 'numSamplesReadFromInput' unsigned, to fix build warning in mediaconduit_unittests.cpp. r=jesup
Bug 913848: Attempt to fix intermittent test_unix_domain.js timeout with MOAR ASYNC. r=mayhemer

This patch makes the tests avoid expecting data from the client to be
available to the server immediately upon accepting a connection; instead,
the server uses asyncWait to receive those first bytes. This changes both
test_echo and test_connect_permission.

I've pushed this through the try server twice, and it didn't hang. In
either case, it adds a few more do_prints to give me more clues about the
source of the problem.