Remove "ftp://ftp." prefix from the URL prefix list.

components/autocomplete/url_prefix.cc

Index: components/autocomplete/url_prefix.cc
diff --git a/components/autocomplete/url_prefix.cc b/components/autocomplete/url_prefix.cc
index ef929e55b7e5410dffdc2883872ddda2895b43e1..61b4900c94760f405ffcf459ce56fdd747fc0033 100644
--- a/components/autocomplete/url_prefix.cc
+++ b/components/autocomplete/url_prefix.cc
@@ -39,7 +39,6 @@ const URLPrefixes& URLPrefix::GetURLPrefixes() {
   if (prefixes.empty()) {
     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("https://www."), 2));
     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("http://www."), 2));
-    prefixes.push_back(URLPrefix(base::ASCIIToUTF16("ftp://ftp."), 2));
     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("ftp://www."), 2));
     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("https://"), 1));
     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("http://"), 1));