Removes code using mus client lib

ui/views/controls/native/native_view_host_aura_unittest.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/native/native_view_host_aura.h"
 
 #include <memory>
 
 #include "base/macros.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 251 matching lines @@
 
   NativeViewHostWindowObserver test_observer;
   child_win->AddObserver(&test_observer);
 
   host()->Detach();
   EXPECT_EQ(root_window, child_win->GetRootWindow());
   EXPECT_EQ(child_win_tree_host, child_win->GetHost());
 
   DestroyHost();
   DestroyTopLevel();
-  if (!IsMus() && !IsAuraMusClient()) {
+  if (!IsMus()) {
     // The window is detached, so no longer associated with any Widget
     // hierarchy. The root window still owns it, but the test harness checks
     // for orphaned windows during TearDown().
     EXPECT_EQ(0u, test_observer.events().size())
         << (*test_observer.events().begin()).type;
     delete child_win;
   } else {
     // In mus and aura-mus, the child window is still attached to the
     // aura::WindowTreeHost for the Widget. So destroying the toplevel Widget
     // takes down the child window with it.
@@ skipping 87 matching lines @@
 
   host()->SetVisible(false);
   EXPECT_FALSE(clipping_window()->IsVisible());
   EXPECT_FALSE(child()->IsVisible());
 
   DestroyHost();
   DestroyTopLevel();
 }
 
 }  // namespace views