Remove old (dead) app list code.

ui/app_list/views/app_list_view_unittest.cc

Index: ui/app_list/views/app_list_view_unittest.cc
diff --git a/ui/app_list/views/app_list_view_unittest.cc b/ui/app_list/views/app_list_view_unittest.cc
index 242bfa4e22d649af49d2022e39b0575ee7401aa2..ba3519f6fa7ebbd924ee579d4d0d50d242d90c77 100644
--- a/ui/app_list/views/app_list_view_unittest.cc
+++ b/ui/app_list/views/app_list_view_unittest.cc
@@ -98,7 +98,7 @@ class AppListViewTestContext {
   // Tests that pressing the search box's back button navigates correctly.
   void RunBackTest();
 
-  // Tests displaying of the experimental app list and shows the start page.
+  // Tests displaying of the app list and shows the start page.
   void RunStartPageTest();
 
   // Tests switching rapidly between multiple pages of the launcher.
@@ -161,11 +161,6 @@ class UnitTestViewDelegate : public app_list::test::AppListTestViewDelegate {
   explicit UnitTestViewDelegate(AppListViewTestContext* parent)
       : parent_(parent) {}
 
-  // Overridden from app_list::AppListViewDelegate:
-  bool ShouldCenterWindow() const override {
-    return app_list::switches::IsCenteredAppListEnabled();
-  }
-
   // Overridden from app_list::test::AppListTestViewDelegate:
   void ViewClosing() override { parent_->NativeWidgetClosing(); }