Folds methods in WmShellCommon to WmShell

ash/wm/panels/panel_layout_manager_unittest.cc

Index: ash/wm/panels/panel_layout_manager_unittest.cc
diff --git a/ash/wm/panels/panel_layout_manager_unittest.cc b/ash/wm/panels/panel_layout_manager_unittest.cc
index a917efd5d697c4d66e7f09f76baa5c4407908a9b..3ea0f31e536ce9341f10642f3258a1c640f8f45a 100644
--- a/ash/wm/panels/panel_layout_manager_unittest.cc
+++ b/ash/wm/panels/panel_layout_manager_unittest.cc
@@ -11,6 +11,7 @@
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wm/mru_window_tracker.h"
 #include "ash/common/wm/window_state.h"
+#include "ash/common/wm_shell.h"
 #include "ash/screen_util.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_button.h"
@@ -733,7 +734,7 @@ TEST_F(PanelLayoutManagerTest, PanelsHideAndRestoreWithShelf) {
   // While in full-screen mode, the panel windows should still be in the
   // switchable window list - http://crbug.com/313919.
   aura::Window::Windows switchable_window_list = WmWindowAura::ToAuraWindows(
-      Shell::GetInstance()->mru_window_tracker()->BuildMruWindowList());
+      WmShell::Get()->mru_window_tracker()->BuildMruWindowList());
   EXPECT_EQ(3u, switchable_window_list.size());
   EXPECT_NE(switchable_window_list.end(),
             std::find(switchable_window_list.begin(),