Removes pinning code from TopSites as we no longer need it.

chrome/browser/ui/webui/ntp/most_visited_handler.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/ntp/most_visited_handler.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 191 matching lines @@
 }
 
 std::string MostVisitedHandler::GetDictionaryKeyForURL(const std::string& url) {
   return base::MD5String(url);
 }
 
 // static
 void MostVisitedHandler::RegisterUserPrefs(PrefService* prefs) {
   prefs->RegisterDictionaryPref(prefs::kNtpMostVisitedURLsBlacklist,
                                 PrefService::UNSYNCABLE_PREF);
-  // TODO(estade): remove this.
-  prefs->RegisterDictionaryPref(prefs::kNtpMostVisitedPinnedURLs,
-                                PrefService::UNSYNCABLE_PREF);
 }