Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/ui/webui/ntp/suggestions_page_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/suggestions_page_handler.h"
 
 #include <math.h>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/md5.h"
 #include "base/metrics/histogram.h"
 #include "base/string16.h"
 #include "base/threading/thread.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/history/page_usage_data.h"
 #include "chrome/browser/history/top_sites.h"
+#include "chrome/browser/prefs/pref_registry_syncable.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/favicon_source.h"
+#include "chrome/browser/ui/webui/ntp/ntp_stats.h"
 #include "chrome/browser/ui/webui/ntp/suggestions_combiner.h"
-#include "chrome/browser/ui/webui/ntp/ntp_stats.h"
 #include "chrome/browser/ui/webui/ntp/suggestions_source_top_sites.h"
 #include "chrome/browser/ui/webui/ntp/thumbnail_source.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/url_data_source.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents.h"
@@ skipping 150 matching lines @@
 
 void SuggestionsHandler::BlacklistURL(const GURL& url) {
   // TODO(georgey) blacklist an URL.
 }
 
 std::string SuggestionsHandler::GetDictionaryKeyForURL(const std::string& url) {
   return base::MD5String(url);
 }
 
 // static
-void SuggestionsHandler::RegisterUserPrefs(PrefServiceSyncable* prefs) {
+void SuggestionsHandler::RegisterUserPrefs(PrefRegistrySyncable* registry) {
   // TODO(georgey) add user preferences (such as own blacklist) as needed.
 }