mus: Show USER_PRIVATE window container during views tests

components/mus/mus_app.cc

Index: components/mus/mus_app.cc
diff --git a/components/mus/mus_app.cc b/components/mus/mus_app.cc
index 52525daea891078d7201a537a87d1258d1fcbec4..2a88c6f2e8a3af49eea5cdcfa2c2af5845a9f6d7 100644
--- a/components/mus/mus_app.cc
+++ b/components/mus/mus_app.cc
@@ -12,7 +12,7 @@
 #include "base/memory/weak_ptr.h"
 #include "base/threading/platform_thread.h"
 #include "build/build_config.h"
-#include "components/mus/common/args.h"
+#include "components/mus/common/switches.h"
 #include "components/mus/gles2/gpu_impl.h"
 #include "components/mus/ws/display.h"
 #include "components/mus/ws/display_binding.h"
@@ -138,8 +138,8 @@ void MusApp::Initialize(shell::Connector* connector,
   tracing_.Initialize(connector, identity.name());
   TRACE_EVENT0("mus", "MusApp::Initialize started");
 
-  test_config_ =
-      base::CommandLine::ForCurrentProcess()->HasSwitch(kUseTestConfig);
+  test_config_ = base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kUseTestConfig);
 #if defined(USE_X11)
   XInitThreads();
   if (test_config_)