Remove old (dead) app list code.

ui/app_list/views/app_list_main_view.h

Index: ui/app_list/views/app_list_main_view.h
diff --git a/ui/app_list/views/app_list_main_view.h b/ui/app_list/views/app_list_main_view.h
index b75c89026e6b88c8bd1bff39a60790a9c51c4177..3dc4fd22e7191536047c75abf010da8550247a39 100644
--- a/ui/app_list/views/app_list_main_view.h
+++ b/ui/app_list/views/app_list_main_view.h
@@ -66,9 +66,6 @@ class APP_LIST_EXPORT AppListMainView : public views::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();