Revert 179302

ash/shell/app_list.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 <string>
 
 #include "ash/shell.h"
 #include "ash/shell/example_factory.h"
 #include "ash/shell/toplevel_window.h"
 #include "ash/shell_delegate.h"
@@ skipping 207 matching lines @@
     search_box_model->SetHintText(ASCIIToUTF16("Type to search..."));
   }
 
   // Overridden from ash::AppListViewDelegate:
   virtual void SetModel(app_list::AppListModel* model) OVERRIDE {
     model_ = model;
     PopulateApps(model_->apps());
     DecorateSearchBox(model_->search_box());
   }
 
-  virtual app_list::SigninDelegate* GetSigninDelegate() OVERRIDE {
-    return NULL;
-  }
-
   virtual void ActivateAppListItem(app_list::AppListItemModel* item,
                                    int event_flags) OVERRIDE {
     static_cast<WindowTypeLauncherItem*>(item)->Activate(event_flags);
   }
 
   virtual void OpenSearchResult(const app_list::SearchResult& result,
                                 int event_flags) OVERRIDE {
     const ExampleSearchResult* example_result =
         static_cast<const ExampleSearchResult*>(&result);
     WindowTypeLauncherItem::Activate(example_result->type(), event_flags);
@@ skipping 52 matching lines @@
 };
 
 }  // namespace
 
 app_list::AppListViewDelegate* CreateAppListViewDelegate() {
   return new ExampleAppListViewDelegate;
 }
 
 }  // namespace shell
 }  // namespace ash