Reduce footprint of registry controlled domain table

net/tools/tld_cleanup/README

Index: net/tools/tld_cleanup/README
diff --git a/net/tools/tld_cleanup/README b/net/tools/tld_cleanup/README
index a7f137d7660f88d4babb8e8b0a222246d39c63b7..13614700e4224e01e45508ce6f2b8e7dc4d5dc21 100644
--- a/net/tools/tld_cleanup/README
+++ b/net/tools/tld_cleanup/README
@@ -20,12 +20,9 @@ When updating src/net/base/registry_controlled_domains/effective_tld_names.dat:
    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