PRIntn enumDeleteEntry(nsHashKey *aKey, void *aData, void* closure)
PRIntn PR_CALLBACK enumDeleteEntry(nsHashKey *aKey, void *aData, void* closure)
PRIntn enumDeleteEntry(nsHashKey *aKey, void *aData, void* closure){  HistoryEntry *entry = NS_STATIC_CAST(HistoryEntry*, aData);  delete entry;    return PR_TRUE;}