Removing PrefObserver usage, batch 4.

chrome/browser/extensions/external_policy_loader.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/extensions/external_policy_loader.h"
 
 #include "base/logging.h"
 #include "base/values.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 23 matching lines @@
     return false;
   }
   return true;
 }
 
 }  // namespace
 
 ExternalPolicyLoader::ExternalPolicyLoader(Profile* profile)
     : profile_(profile) {
   pref_change_registrar_.Init(profile_->GetPrefs());
-  pref_change_registrar_.Add(prefs::kExtensionInstallForceList, this);
+  pref_change_registrar_.Add(prefs::kExtensionInstallForceList,
+                             base::Bind(&ExternalPolicyLoader::StartLoading,
+                                        base::Unretained(this)));
   notification_registrar_.Add(this,
                               chrome::NOTIFICATION_PROFILE_DESTROYED,
                               content::Source<Profile>(profile_));
 }
 
 void ExternalPolicyLoader::StartLoading() {
   const ListValue* forcelist =
       profile_->GetPrefs()->GetList(prefs::kExtensionInstallForceList);
   DictionaryValue* result = new DictionaryValue();
   if (forcelist != NULL) {
@@ skipping 26 matching lines @@
   if (profile_ == NULL) return;
   DCHECK(type == chrome::NOTIFICATION_PROFILE_DESTROYED) <<
       "Unexpected notification type.";
   if (content::Source<Profile>(source).ptr() == profile_) {
     notification_registrar_.RemoveAll();
     pref_change_registrar_.RemoveAll();
     profile_ = NULL;
   }
 }
 
-void ExternalPolicyLoader::OnPreferenceChanged(PrefServiceBase* service,
-                                               const std::string& pref_name) {
-  if (service == profile_->GetPrefs()) {
-    DCHECK_EQ(std::string(prefs::kExtensionInstallForceList), pref_name);
-    StartLoading();
-  }
-}
-
 }  // namespace extensions