Revert of Draggable peeking/fullscreen launcher with transparent background.

ui/app_list/views/search_box_view.h

Index: ui/app_list/views/search_box_view.h
diff --git a/ui/app_list/views/search_box_view.h b/ui/app_list/views/search_box_view.h
index db647e9165e8ac15819065cad42225d5fd16e1e9..8b5790bc418993e9a1a06de47d20851989d23358 100644
--- a/ui/app_list/views/search_box_view.h
+++ b/ui/app_list/views/search_box_view.h
@@ -31,7 +31,6 @@
 };
 
 class AppListModel;
-class AppListView;
 class AppListViewDelegate;
 class SearchBoxModel;
 class SearchBoxViewDelegate;
@@ -48,8 +47,7 @@
                                       public SpeechUIModelObserver {
  public:
   SearchBoxView(SearchBoxViewDelegate* delegate,
-                AppListViewDelegate* view_delegate,
-                AppListView* app_list_view = nullptr);
+                AppListViewDelegate* view_delegate);
   ~SearchBoxView() override;
 
   void ModelChanged();
@@ -120,7 +118,6 @@
   SearchBoxImageButton* speech_button_;  // Owned by views hierarchy.
   views::Textfield* search_box_;  // Owned by views hierarchy.
   views::View* contents_view_;  // Owned by views hierarchy.
-  app_list::AppListView* app_list_view_;  // Owned by views hierarchy.
 
   SearchBoxFocus focused_view_;  // Which element has TAB'd focus.