Lazily build the app list model.

chrome/browser/ui/app_list/app_list_view_delegate.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/app_list/app_list_view_delegate.h"
 
 #include <vector>
 
 #include "apps/custom_launcher_page_contents.h"
 #include "base/callback.h"
@@ skipping 296 matching lines @@
   tracked_objects::ScopedTracker tracking_profile3(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
           "431326 AppListViewDelegate::SetProfile3"));
   template_url_service_observer_.RemoveAll();
   if (app_list::switches::IsExperimentalAppListEnabled()) {
     TemplateURLService* template_url_service =
         TemplateURLServiceFactory::GetForProfile(profile_);
     template_url_service_observer_.Add(template_url_service);
   }
 
-  model_ =
-      app_list::AppListSyncableServiceFactory::GetForProfile(profile_)->model();
+  model_ = app_list::AppListSyncableServiceFactory::GetForProfile(profile_)
+               ->GetModel();
 
 #if defined(USE_ASH)
   app_sync_ui_state_watcher_.reset(new AppSyncUIStateWatcher(profile_, model_));
 #endif
 
   SetUpSearchUI();
   SetUpProfileSwitcher();
   SetUpCustomLauncherPages();
   OnTemplateURLServiceChanged();
 
@@ skipping 516 matching lines @@
 
       // SigninManagerFactory is not a leaky singleton (unlike this class), and
       // its destructor will check that it has no remaining observers.
       scoped_observer_.RemoveAll();
       SigninManagerFactory::GetInstance()->RemoveObserver(this);
       break;
     default:
       NOTREACHED();
   }
 }