Moves app_list() and related functions from Shell to WmShell

ash/accelerators/accelerator_controller_unittest.cc

Index: ash/accelerators/accelerator_controller_unittest.cc
diff --git a/ash/accelerators/accelerator_controller_unittest.cc b/ash/accelerators/accelerator_controller_unittest.cc
index f50aa05067a9542f594d62dfb820bdde8a1091a4..c132a7b7a5ccb8f25ad3e0cf5d11f349707548b5 100644
--- a/ash/accelerators/accelerator_controller_unittest.cc
+++ b/ash/accelerators/accelerator_controller_unittest.cc
@@ -1020,7 +1020,7 @@ TEST_F(AcceleratorControllerTest, GlobalAccelerators) {
 
 TEST_F(AcceleratorControllerTest, GlobalAcceleratorsToggleAppList) {
   app_list::test::TestAppListPresenter test_app_list_presenter;
-  WmShell::Get()->app_list()->SetAppListPresenter(
+  Shell::Get()->app_list()->SetAppListPresenter(
       test_app_list_presenter.CreateInterfacePtrAndBind());
   AccessibilityDelegate* delegate =
       Shell::GetInstance()->accessibility_delegate();