Remove PrefObserver usage, batch 9.

chrome/browser/ui/app_list/apps_model_builder.cc

Index: chrome/browser/ui/app_list/apps_model_builder.cc
diff --git a/chrome/browser/ui/app_list/apps_model_builder.cc b/chrome/browser/ui/app_list/apps_model_builder.cc
index 6932c70a79886d345812b9eabd34a33a265a423b..8694caa81b06c2778fde6950bd53532e3da16ff9 100644
--- a/chrome/browser/ui/app_list/apps_model_builder.cc
+++ b/chrome/browser/ui/app_list/apps_model_builder.cc
@@ -57,7 +57,9 @@ AppsModelBuilder::AppsModelBuilder(Profile* profile,
       content::Source<Profile>(profile_));
 
   pref_change_registrar_.Init(extension_prefs->pref_service());
-  pref_change_registrar_.Add(extensions::ExtensionPrefs::kExtensionsPref, this);
+  pref_change_registrar_.Add(extensions::ExtensionPrefs::kExtensionsPref,
+                             base::Bind(&AppsModelBuilder::ResortApps,
+                                        base::Unretained(this)));
 
   model_->AddObserver(this);
 }
@@ -213,11 +215,6 @@ void AppsModelBuilder::Observe(int type,
   }
 }
 
-void AppsModelBuilder::OnPreferenceChanged(PrefServiceBase* service,
-                                           const std::string& pref_name) {
-  ResortApps();
-}
-
 void AppsModelBuilder::ListItemsAdded(size_t start, size_t count) {
 }