Bug 931641 - Intermittent test_contextmenu_nested.xul failure, r=ehsan

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extra : rebase_source : c5341f590e827dee214d6e5a0953db6b78665309
Bug 944125 - test_bug602962.xul is racy, r=ehsan

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extra : rebase_source : 183ab49a00239b39518ee67cb547caa1fac9333e
Bug 944126 - Random failures with browser_privatebrowsing_aboutSessionRestore.js, r=ehsan

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extra : rebase_source : 163eb5bc1e765958136f7f54211cf5b0cca0a69d
Bug 944128 - Random failures with test_bug_461710_perwindowpb.html, r=ehsan

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extra : rebase_source : c572f2fba1ad41844dba62f3967697379d8f6484