Revert 179302

ui/app_list/app_list_view_delegate.h

 // 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.
 
 #ifndef UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_
 #define UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_
 
 #include "ui/app_list/app_list_export.h"
 
 namespace app_list {
 
 class AppListItemModel;
 class AppListModel;
 class SearchResult;
-class SigninDelegate;
 
 class APP_LIST_EXPORT AppListViewDelegate {
  public:
   // AppListView owns the delegate.
   virtual ~AppListViewDelegate() {}
 
   // Invoked to set the model that AppListView uses.
   // Note that AppListView owns the model.
   virtual void SetModel(AppListModel* model) = 0;
 
-  // Gets the SigninDelegate for the app list. Owned by the AppListViewDelegate.
-  virtual SigninDelegate* GetSigninDelegate() = 0;
-
   // Invoked when an AppListeItemModelView is activated by click or enter key.
   virtual void ActivateAppListItem(AppListItemModel* item,
                                    int event_flags) = 0;
 
   // Invoked to start a new search. Delegate collects query input from
   // SearchBoxModel and populates SearchResults. Both models are sub models
   // of AppListModel.
   virtual void StartSearch() = 0;
 
   // Invoked to stop the current search.
@@ skipping 16 matching lines @@
   // Invoked when the app list is closing.
   virtual void ViewClosing() = 0;
 
   // Invoked when the app list's activated state changes.
   virtual void ViewActivationChanged(bool active) = 0;
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_