Remove PrefObserver usages, batch 10.

chrome/browser/ui/webui/ntp/app_launcher_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/app_launcher_handler.h"
 
 #include <string>
 #include <vector>
 
 #include "base/auto_reset.h"
@@ skipping 312 matching lines @@
     }
     case chrome::NOTIFICATION_EXTENSION_LOAD_ERROR: {
       attempted_bookmark_app_install_ = false;
       break;
     }
     default:
       NOTREACHED();
   }
 }
 
-void AppLauncherHandler::OnPreferenceChanged(PrefServiceBase* service,
-                                             const std::string& pref_name) {
-  DictionaryValue dictionary;
-  FillAppDictionary(&dictionary);
-  web_ui()->CallJavascriptFunction("ntp.appsPrefChangeCallback",
-                                   dictionary);
-}
-
 void AppLauncherHandler::FillAppDictionary(DictionaryValue* dictionary) {
   // CreateAppInfo and ClearOrdinals can change the extension prefs.
   AutoReset<bool> auto_reset(&ignore_changes_, true);
 
   ListValue* list = new ListValue();
 
   for (std::set<std::string>::iterator it = visible_apps_.begin();
        it != visible_apps_.end(); ++it) {
     const Extension* extension = extension_service_->GetInstalledExtension(*it);
     if (extension && extension->ShouldDisplayInNewTabPage()) {
@@ skipping 81 matching lines @@
     }
   }
 
   SetAppToBeHighlighted();
   FillAppDictionary(&dictionary);
   web_ui()->CallJavascriptFunction("ntp.getAppsCallback", dictionary);
 
   // First time we get here we set up the observer so that we can tell update
   // the apps as they change.
   if (!has_loaded_apps_) {
+    base::Closure callback = base::Bind(
+        &AppLauncherHandler::OnPreferenceChanged,
+        base::Unretained(this));
     pref_change_registrar_.Init(
         extension_service_->extension_prefs()->pref_service());
-    pref_change_registrar_.Add(ExtensionPrefs::kExtensionsPref, this);
-    pref_change_registrar_.Add(prefs::kNtpAppPageNames, this);
+    pref_change_registrar_.Add(ExtensionPrefs::kExtensionsPref, callback);
+    pref_change_registrar_.Add(prefs::kNtpAppPageNames, callback);
 
     registrar_.Add(this, chrome::NOTIFICATION_APP_NOTIFICATION_STATE_CHANGED,
         content::Source<Profile>(profile));
     registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_LOADED,
         content::Source<Profile>(profile));
     registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
         content::Source<Profile>(profile));
     registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_LAUNCHER_REORDERED,
         content::Source<ExtensionSorting>(
             extension_service_->extension_prefs()->extension_sorting()));
@@ skipping 312 matching lines @@
 
 void AppLauncherHandler::SetAppToBeHighlighted() {
   if (highlight_app_id_.empty())
     return;
 
   StringValue app_id(highlight_app_id_);
   web_ui()->CallJavascriptFunction("ntp.setAppToBeHighlighted", app_id);
   highlight_app_id_.clear();
 }
 
+void AppLauncherHandler::OnPreferenceChanged() {
+  DictionaryValue dictionary;
+  FillAppDictionary(&dictionary);
+  web_ui()->CallJavascriptFunction("ntp.appsPrefChangeCallback", dictionary);
+}
+
 // static
 void AppLauncherHandler::RegisterUserPrefs(PrefServiceBase* pref_service) {
   pref_service->RegisterListPref(prefs::kNtpAppPageNames,
                                  PrefService::SYNCABLE_PREF);
 }
 
 void AppLauncherHandler::CleanupAfterUninstall() {
   extension_id_prompting_.clear();
 }
 
@@ skipping 134 matching lines @@
   return extension_uninstall_dialog_.get();
 }
 
 ExtensionInstallPrompt* AppLauncherHandler::GetExtensionInstallPrompt() {
   if (!extension_install_ui_.get()) {
     extension_install_ui_.reset(
         new ExtensionInstallPrompt(web_ui()->GetWebContents()));
   }
   return extension_install_ui_.get();
 }