Removes code using mus client lib

ui/views/focus/focus_manager_unittest.cc

Index: ui/views/focus/focus_manager_unittest.cc
diff --git a/ui/views/focus/focus_manager_unittest.cc b/ui/views/focus/focus_manager_unittest.cc
index b1f5225ddbd8e1e6f57bde129c42cf3b3208f4e3..26f1f65870bfeed187aa113c418356f18bedb3f9 100644
--- a/ui/views/focus/focus_manager_unittest.cc
+++ b/ui/views/focus/focus_manager_unittest.cc
@@ -125,7 +125,7 @@ TEST_F(FocusManagerTest, WidgetFocusChangeListener) {
   // TODO: this test ends up calling focus on the aura::Window associated with
   // the Widget and expecting that to change activation. This should work for
   // aura-mus-client as well. http://crbug.com/664261.
-  if (IsAuraMusClient())
+  if (IsMus())
     return;
 
   // First, ensure the simulator is aware of the Widget created in SetUp() being
@@ -856,9 +856,6 @@ class AdvanceFocusWidgetDelegate : public WidgetDelegate {
 
 // Verifies focus wrapping happens in the same widget.
 TEST_F(FocusManagerTest, AdvanceFocusStaysInWidget) {
-  // Mus doesn't support child Widgets well yet. https://crbug.com/612820
-  if (IsMus())
-    return;
   // Add |widget_view| as a child of the Widget.
   View* widget_view = new View;
   widget_view->SetFocusBehavior(View::FocusBehavior::ALWAYS);