Revert of Replace AllAppsTileItemView with ArrowExpandView

ui/app_list/views/expand_arrow_view.h

Index: ui/app_list/views/expand_arrow_view.h
diff --git a/ui/app_list/views/expand_arrow_view.h b/ui/app_list/views/expand_arrow_view.h
deleted file mode 100644
index b1064ad43dccd4a29374ddec4eda5440df533999..0000000000000000000000000000000000000000
--- a/ui/app_list/views/expand_arrow_view.h
+++ /dev/null
@@ -1,56 +0,0 @@
-// Copyright 2017 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_EXPAND_ARROW_VIEW_H_
-#define UI_APP_LIST_VIEWS_EXPAND_ARROW_VIEW_H_
-
-#include "ui/views/controls/button/button.h"
-#include "ui/views/controls/button/custom_button.h"
-
-namespace views {
-class ImageView;
-class InkDrop;
-class InkDropMask;
-class InkDropRipple;
-class InkDropHighlight;
-}  // namespace views
-
-namespace app_list {
-
-class AppListView;
-class ContentsView;
-
-// A tile item for the expand arrow on the start page.
-class ExpandArrowView : public views::CustomButton,
-                        public views::ButtonListener {
- public:
-  ExpandArrowView(ContentsView* contents_view, AppListView* app_list_view);
-  ~ExpandArrowView() override;
-
-  // Overridden from views::ButtonListener:
-  void ButtonPressed(views::Button* sender, const ui::Event& event) override;
-
-  // Overridden from views::View:
-  gfx::Size CalculatePreferredSize() const override;
-  void Layout() override;
-
-  // Overridden from views::InkDropHost:
-  std::unique_ptr<views::InkDrop> CreateInkDrop() override;
-  std::unique_ptr<views::InkDropMask> CreateInkDropMask() const override;
-  std::unique_ptr<views::InkDropRipple> CreateInkDropRipple() const override;
-  std::unique_ptr<views::InkDropHighlight> CreateInkDropHighlight()
-      const override;
-
- private:
-  ContentsView* const contents_view_;
-  AppListView* const app_list_view_;  // Owned by the views hierarchy.
-
-  views::ImageView* icon_;
-
-  DISALLOW_COPY_AND_ASSIGN(ExpandArrowView);
-};
-
-}  // namespace app_list
-
-#endif  // UI_APP_LIST_VIEWS_EXPAND_ARROW_VIEW_H_