alternate ntp: persist show-search-provider-logo option at chrome://instant

chrome/browser/autocomplete/zero_suggest_provider.cc

Index: chrome/browser/autocomplete/zero_suggest_provider.cc
diff --git a/chrome/browser/autocomplete/zero_suggest_provider.cc b/chrome/browser/autocomplete/zero_suggest_provider.cc
index 2d76c9cb5cdbaf455ab889ed6ca490041f1c1b74..3297c3b9ea58b3c0d97c0aea14c182b2ff287cde 100644
--- a/chrome/browser/autocomplete/zero_suggest_provider.cc
+++ b/chrome/browser/autocomplete/zero_suggest_provider.cc
@@ -53,12 +53,6 @@ ZeroSuggestProvider::ZeroSuggestProvider(
       template_url_service_(TemplateURLServiceFactory::GetForProfile(profile)) {
 }
 
-// static
-void ZeroSuggestProvider::RegisterUserPrefs(PrefService* user_prefs) {
-  user_prefs->RegisterStringPref(prefs::kExperimentalZeroSuggestUrlPrefix, "",
-                                 PrefService::UNSYNCABLE_PREF);
-}
-
 void ZeroSuggestProvider::Start(const AutocompleteInput& input,
                                 bool /*minimal_changes*/) {
   UpdateMatches(input.text());