Remove PrefObserver usages, batch 10.

chrome/browser/ui/webui/ntp/new_tab_ui.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 "build/build_config.h"
 
 #include "chrome/browser/ui/webui/ntp/new_tab_ui.h"
 
 #include <set>
 
@@ skipping 146 matching lines @@
     html_source->AddResource("suggestions_page.js", "application/javascript",
         IDR_SUGGESTIONS_PAGE_JS);
   }
   // ChromeURLDataManager assumes the ownership of the html_source and in some
   // tests immediately deletes it, so html_source should not be accessed after
   // this call.
   Profile* profile = GetProfile();
   ChromeURLDataManager::AddDataSource(profile, html_source);
 
   pref_change_registrar_.Init(GetProfile()->GetPrefs());
-  pref_change_registrar_.Add(prefs::kShowBookmarkBar, this);
+  pref_change_registrar_.Add(prefs::kShowBookmarkBar,
+                             base::Bind(&NewTabUI::OnShowBookmarkBarChanged,
+                                        base::Unretained(this)));
 
 #if defined(ENABLE_THEMES)
   // Listen for theme installation.
   registrar_.Add(this, chrome::NOTIFICATION_BROWSER_THEME_CHANGED,
                  content::Source<ThemeService>(
                      ThemeServiceFactory::GetForProfile(GetProfile())));
 #endif
 }
 
 NewTabUI::~NewTabUI() {
@@ skipping 75 matching lines @@
 #endif
     case content::NOTIFICATION_RENDER_WIDGET_HOST_DID_UPDATE_BACKING_STORE: {
       last_paint_ = base::TimeTicks::Now();
       break;
     }
     default:
       CHECK(false) << "Unexpected notification: " << type;
   }
 }
 
-void NewTabUI::OnPreferenceChanged(PrefServiceBase* service,
-                                   const std::string& pref_name) {
+void NewTabUI::OnShowBookmarkBarChanged() {
   StringValue attached(
       GetProfile()->GetPrefs()->GetBoolean(prefs::kShowBookmarkBar) ?
           "true" : "false");
   web_ui()->CallJavascriptFunction("ntp.setBookmarkBarAttached", attached);
 }
 
 void NewTabUI::InitializeCSSCaches() {
 #if defined(ENABLE_THEMES)
   Profile* profile = GetProfile();
   ThemeSource* theme = new ThemeSource(profile);
@@ skipping 140 matching lines @@
 void NewTabUI::NewTabHTMLSource::AddResource(const char* resource,
                                              const char* mime_type,
                                              int resource_id) {
   DCHECK(resource);
   DCHECK(mime_type);
   resource_map_[std::string(resource)] =
       std::make_pair(std::string(mime_type), resource_id);
 }
 
 NewTabUI::NewTabHTMLSource::~NewTabHTMLSource() {}