Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/ui/alternate_error_tab_observer.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/alternate_error_tab_observer.h"
 
 #include "chrome/browser/google/google_util.h"
+#include "chrome/browser/prefs/pref_registry_syncable.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 
 using content::RenderViewHost;
 using content::WebContents;
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(AlternateErrorPageTabObserver);
 
 AlternateErrorPageTabObserver::AlternateErrorPageTabObserver(
     WebContents* web_contents)
     : content::WebContentsObserver(web_contents),
       profile_(Profile::FromBrowserContext(web_contents->GetBrowserContext())) {
-  PrefServiceSyncable* prefs = profile_->GetPrefs();
+  PrefService* prefs = profile_->GetPrefs();
   if (prefs) {
     pref_change_registrar_.Init(prefs);
     pref_change_registrar_.Add(
         prefs::kAlternateErrorPagesEnabled,
         base::Bind(&AlternateErrorPageTabObserver::
                        OnAlternateErrorPagesEnabledChanged,
                    base::Unretained(this)));
   }
 
   registrar_.Add(this, chrome::NOTIFICATION_GOOGLE_URL_UPDATED,
                  content::Source<Profile>(profile_->GetOriginalProfile()));
 }
 
 AlternateErrorPageTabObserver::~AlternateErrorPageTabObserver() {
 }
 
 // static
 void AlternateErrorPageTabObserver::RegisterUserPrefs(
-    PrefServiceSyncable* prefs) {
+    PrefRegistrySyncable* prefs) {
   prefs->RegisterBooleanPref(prefs::kAlternateErrorPagesEnabled, true,
-                             PrefServiceSyncable::SYNCABLE_PREF);
+                             PrefRegistrySyncable::SYNCABLE_PREF);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WebContentsObserver overrides
 
 void AlternateErrorPageTabObserver::RenderViewCreated(
     RenderViewHost* render_view_host) {
   UpdateAlternateErrorPageURL(render_view_host);
 }
 
@@ skipping 28 matching lines @@
 }
 
 void AlternateErrorPageTabObserver::OnAlternateErrorPagesEnabledChanged() {
   UpdateAlternateErrorPageURL(web_contents()->GetRenderViewHost());
 }
 
 void AlternateErrorPageTabObserver::UpdateAlternateErrorPageURL(
     RenderViewHost* rvh) {
   rvh->SetAltErrorPageURL(GetAlternateErrorPageURL());
 }