Reduce footprint of registry controlled domain table

net/tools/tld_cleanup/README

 When updating src/net/base/registry_controlled_domains/effective_tld_names.dat:
 
 1. Obtain the new effective_tld_names.dat, probably by downloading
    http://goo.gl/Ji2bB
 
 2. Remove whitespace from the ends of the lines.
    You could possibly use something like:
      sed -i -e "s/\s*$//g" \
          src/net/base/registry_controlled_domains/effective_tld_names.dat
 
 3. Add the Chromium note back in just after the license at the top, and just
    before '===BEGIN ICANN DOMAINS==='. Ensure there is an empty line above and
    two empty lines below the note. The note should say:
 // Chromium note: this is based on Mozilla's file:
 //  http://mxr.mozilla.org/mozilla-central/source/netwerk/dns/effective_tld_names.dat?raw=1
 
 4. Build tld_cleanup (the "(net)" > "tld_cleanup" project)
 
 5. Run it (no arguments needed), typically from src/build/Release or
    src/build/Debug. It will re-generate
    src/net/base/registry_controlled_domains/effective_tld_names.gperf.
 
-6. Run gperf on the new effective_tld_names.gperf:
-     pushd src/net/base/registry_controlled_domains;
-     gperf -a -L "C++" -C -c -o -t -k '*' -NFindDomain -P -K name_offset -D -m 10 \
-         effective_tld_names.gperf > effective_tld_names.cc;
-     popd;
-   It will produce a new effective_tld_names.cc.
+6. Check in the updated effective_tld_names.dat, effective_tld_names.gperf
 
-7. Check in the updated effective_tld_names.dat, effective_tld_names.gperf,
-   and effective_tld_names.cc together.
+Note that gperf is no longer used for effective_tld_names, but when building
+chromium the file effective_tld_names.gperf will be parsed by make_dafsa.py
+to generate the file effective_tld_names-inc.cc, which is included in
+registry_controlled_domain.cc