Bug 847248 (part 10) - Rewrite TimerEventAllocator and remove nsFixedSizeAllocator.  r=bz,ehsan;  sr=bsmedberg.

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extra : rebase_source : aaa9c2d0ffd268e8f1b9184e8230b1e7932f014d
Bug 851985 - Mark tests that don't reliably block onload (or loadeddata) as random. r=doublec
bug 833256 - role=note should use eFromSubTreeIfRec name rule not eFromSubTree r=tbsaunde f=surkov