Revert of Replace AllAppsTileItemView with ArrowExpandView

ui/app_list/views/start_page_view.cc

Index: ui/app_list/views/start_page_view.cc
diff --git a/ui/app_list/views/start_page_view.cc b/ui/app_list/views/start_page_view.cc
index fb4e24f1c195d1dc0103eae892ff89e9c3aa3add..ad3b9b8878da615294abda11bb610b4596484779 100644
--- a/ui/app_list/views/start_page_view.cc
+++ b/ui/app_list/views/start_page_view.cc
@@ -23,7 +23,6 @@
 #include "ui/app_list/views/app_list_main_view.h"
 #include "ui/app_list/views/contents_view.h"
 #include "ui/app_list/views/custom_launcher_page_view.h"
-#include "ui/app_list/views/expand_arrow_view.h"
 #include "ui/app_list/views/indicator_chip_view.h"
 #include "ui/app_list/views/search_box_view.h"
 #include "ui/app_list/views/search_result_container_view.h"
@@ -57,7 +56,6 @@
 constexpr int kWebViewWidth = 700;
 constexpr int kWebViewHeight = 224;
 
-constexpr int kExpandArrowTopPadding = 28;
 constexpr int kLauncherPageBackgroundWidth = 400;
 
 }  // namespace
@@ -127,11 +125,6 @@
 
   // The view containing the start page tiles.
   AddChildView(suggestions_container_);
-  if (is_fullscreen_app_list_enabled_) {
-    expand_arrow_view_ = new ExpandArrowView(
-        app_list_main_view_->contents_view(), app_list_view);
-    AddChildView(expand_arrow_view_);
-  }
   AddChildView(custom_launcher_page_background_);
 
   suggestions_container_->SetResults(view_delegate_->GetModel()->results());
@@ -251,18 +244,6 @@
                   0);
   }
   suggestions_container_->SetBoundsRect(bounds);
-
-  if (expand_arrow_view_) {
-    gfx::Rect expand_arrow_rect(GetContentsBounds());
-    int left_right_padding =
-        (bounds.width() - expand_arrow_view_->GetPreferredSize().width()) / 2;
-
-    expand_arrow_rect.Inset(left_right_padding, 0, left_right_padding, 0);
-    expand_arrow_rect.set_y(bounds.bottom() + kExpandArrowTopPadding);
-    expand_arrow_rect.set_height(
-        expand_arrow_view_->GetPreferredSize().height());
-    expand_arrow_view_->SetBoundsRect(expand_arrow_rect);
-  }
 
   CustomLauncherPageView* custom_launcher_page_view =
       app_list_main_view_->contents_view()->custom_page_view();