Folds methods in WmShellCommon to WmShell

ash/wm/mru_window_tracker_unittest.cc

Index: ash/wm/mru_window_tracker_unittest.cc
diff --git a/ash/wm/mru_window_tracker_unittest.cc b/ash/wm/mru_window_tracker_unittest.cc
index f299d75af8331209a120d8b2b834f3ce75471e37..afebbd767a077d899a997835aba11c8c45c2ca38 100644
--- a/ash/wm/mru_window_tracker_unittest.cc
+++ b/ash/wm/mru_window_tracker_unittest.cc
@@ -7,6 +7,7 @@
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wm/window_state.h"
+#include "ash/common/wm_shell.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/window_state_aura.h"
@@ -27,7 +28,7 @@ class MruWindowTrackerTest : public test::AshTestBase {
   }
 
   ash::MruWindowTracker* mru_window_tracker() {
-    return Shell::GetInstance()->mru_window_tracker();
+    return WmShell::Get()->mru_window_tracker();
   }
 
  private: