Promotes WmWindowMus functions to WmWindowAura and nukes WmWindowMus

ash/test/wm_window_aura_test_api.h

Index: ash/test/wm_window_aura_test_api.h
diff --git a/ash/test/wm_window_aura_test_api.h b/ash/test/wm_window_aura_test_api.h
index aeacd8b4e45dc5fce8f9f3d13cf78e1cb001e6de..9b21624939df8ca5620365a85eb848cb07fd3bfc 100644
--- a/ash/test/wm_window_aura_test_api.h
+++ b/ash/test/wm_window_aura_test_api.h
@@ -12,7 +12,7 @@ namespace ash {
 class WmWindowAuraTestApi {
  public:
   // Used by tests to set the default value of
-  // |WmWindowMus::default_use_empty_minimum_size_for_testing_|. This is needed
+  // |WmWindowAura::default_use_empty_minimum_size_for_testing_|. This is needed
   // as tests don't have a good way to reset the value of
   // |use_empty_minimum_size_for_testing_| before the minimum size is queried.
   class GlobalMinimumSizeLock {