MaskPrefixLength  576 net/base/net_util.h unsigned MaskPrefixLength(const IPAddressNumber& mask);
MaskPrefixLength  241 net/base/net_util_posix.cc           net_mask = MaskPrefixLength(netmask.address());
MaskPrefixLength  375 net/dns/address_sorter_posix.cc         info.prefix_length = MaskPrefixLength(netmask.address());