IsHead            528 net/disk_cache/blockfile/rankings.cc   if ((node->address().value() == data->prev) && !IsHead(data->prev, &list))
IsHead            772 net/disk_cache/blockfile/rankings.cc     if (prev->Data()->next != node_addr && IsHead(node_addr, list))
IsHead            188 net/disk_cache/blockfile/rankings.h   bool IsHead(CacheAddr addr, List* list) const;