Remove content::NotificationObserver dependency from most Prefs code.

chrome/browser/plugins/plugin_status_pref_setter.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/plugins/plugin_status_pref_setter.h"
 
 #include "base/bind.h"
 #include "chrome/browser/pepper_flash_settings_manager.h"
 #include "chrome/browser/plugins/plugin_data_remover_helper.h"
 #include "chrome/browser/plugins/plugin_prefs.h"
@@ skipping 10 matching lines @@
 using content::PluginService;
 
 PluginStatusPrefSetter::PluginStatusPrefSetter()
     : profile_(NULL),
       ALLOW_THIS_IN_INITIALIZER_LIST(factory_(this)) {}
 
 PluginStatusPrefSetter::~PluginStatusPrefSetter() {
 }
 
 void PluginStatusPrefSetter::Init(Profile* profile,
-                                  content::NotificationObserver* observer) {
+                                  PrefObserver* observer) {
   clear_plugin_lso_data_enabled_.Init(prefs::kClearPluginLSODataEnabled,
                                       profile->GetPrefs(), observer);
   pepper_flash_settings_enabled_.Init(prefs::kPepperFlashSettingsEnabled,
                                       profile->GetPrefs(), observer);
   profile_ = profile;
   registrar_.Add(this, chrome::NOTIFICATION_PLUGIN_ENABLE_STATUS_CHANGED,
                  content::Source<Profile>(profile));
   StartUpdate();
 }
 
@@ skipping 20 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   // Set the values on the PrefService instead of through the PrefMembers to
   // notify observers if they changed.
   profile_->GetPrefs()->SetBoolean(
       clear_plugin_lso_data_enabled_.GetPrefName().c_str(),
       PluginDataRemoverHelper::IsSupported(plugin_prefs));
   profile_->GetPrefs()->SetBoolean(
       pepper_flash_settings_enabled_.GetPrefName().c_str(),
       PepperFlashSettingsManager::IsPepperFlashInUse(plugin_prefs, NULL));
 }