Remove old (dead) app list code.

ui/app_list/views/contents_view.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_VIEWS_CONTENTS_VIEW_H_
 #define UI_APP_LIST_VIEWS_CONTENTS_VIEW_H_
 
 #include <map>
 #include <memory>
 #include <utility>
@@ skipping 32 matching lines @@
 // grid view, search results). There can be any number of launcher pages, only
 // one of which can be active at a given time. ContentsView provides the user
 // interface for switching between launcher pages, and animates the transition
 // between them.
 class APP_LIST_EXPORT ContentsView : public views::View,
                                      public PaginationModelObserver {
  public:
   explicit ContentsView(AppListMainView* app_list_main_view);
   ~ContentsView() override;
 
-  // Initialize the pages of the launcher. In the experimental launcher, should
-  // be called after set_contents_switcher_view(), or switcher buttons will not
-  // be created.
+  // Initialize the pages of the launcher. Should be called after
+  // set_contents_switcher_view().
   void Init(AppListModel* model);
 
   // The app list gets closed and drag and drop operations need to be cancelled.
   void CancelDrag();
 
   // If |drag_and_drop| is not NULL it will be called upon drag and drop
   // operations outside the application list.
   void SetDragAndDropHostOfCurrentAppList(
       ApplicationDragAndDropHost* drag_and_drop_host);
 
@@ skipping 106 matching lines @@
   // Adds |view| as a new page to the end of the list of launcher pages. The
   // view is inserted as a child of the ContentsView. The page is associated
   // with the name |state|. Returns the index of the new page.
   int AddLauncherPage(AppListPage* view, AppListModel::State state);
 
   // Gets the PaginationModel owned by the AppsGridView.
   // Note: This is different to |pagination_model_|, which manages top-level
   // launcher-page pagination.
   PaginationModel* GetAppsPaginationModel();
 
-  // Special sub views of the ContentsView. All owned by the views hierarchy.
+  // Sub-views of the ContentsView. All owned by the views hierarchy.
   AppsContainerView* apps_container_view_;
   SearchResultPageView* search_results_page_view_;
-
-  // Only used in the experimental app list.
   StartPageView* start_page_view_;
   CustomLauncherPageView* custom_page_view_;
 
   // The child page views. Owned by the views hierarchy.
   std::vector<AppListPage*> app_list_pages_;
 
   // Parent view. Owned by the views hierarchy.
   AppListMainView* app_list_main_view_;
 
   // Maps State onto |view_model_| indices.
   std::map<AppListModel::State, int> state_to_view_;
 
   // Maps |view_model_| indices onto State.
   std::map<int, AppListModel::State> view_to_state_;
 
   // The page that was showing before ShowSearchResults(true) was invoked.
   int page_before_search_;
 
   // Manages the pagination for the launcher pages.
   PaginationModel pagination_model_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentsView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_CONTENTS_VIEW_H_