static size_t
SizeOfPrefFontEntryExcludingThis
    (const uint32_t&                           aKey,
     const nsTArray<nsRefPtr<gfxFontFamily> >& aList,
     nsMallocSizeOfFun                         aMallocSizeOf,
     void*                                     aUserArg)
{
    // again, we only care about the size of the array itself; we don't follow
    // the refPtrs stored in it, because they point to entries already owned
    // and accounted-for by the main font list
    return aList.SizeOfExcludingThis(aMallocSizeOf);
}