Remove old (dead) app list code.

ui/app_list/views/app_list_main_view.h

 // Copyright 2013 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_VIEWS_APP_LIST_MAIN_VIEW_H_
 #define UI_APP_LIST_VIEWS_APP_LIST_MAIN_VIEW_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 48 matching lines @@
 
   // If |drag_and_drop_host| is not NULL it will be called upon drag and drop
   // operations outside the application list.
   void SetDragAndDropHostOfCurrentAppList(
       ApplicationDragAndDropHost* drag_and_drop_host);
 
   ContentsView* contents_view() const { return contents_view_; }
   AppListModel* model() { return model_; }
   AppListViewDelegate* view_delegate() { return delegate_; }
 
-  // Returns true if the app list should be centered and in landscape mode.
-  bool ShouldCenterWindow() const;
-
   // Called when the search box's visibility is changed.
   void NotifySearchBoxVisibilityChanged();
 
   bool ShouldShowCustomLauncherPage() const;
   void UpdateCustomLauncherPageVisibility();
 
   // Overridden from AppListModelObserver:
   void OnCustomLauncherPageEnabledStateChanged(bool enabled) override;
   void OnSearchEngineIsGoogleChanged(bool is_google) override;
 
@@ skipping 42 matching lines @@
   ScopedVector<IconLoader> pending_icon_loaders_;
 
   base::WeakPtrFactory<AppListMainView> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListMainView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_APP_LIST_MAIN_VIEW_H_