Changes views_aura_mus_unittests to create DesktopNativeWidgetAura

ui/views/widget/native_widget_unittest.cc

Index: ui/views/widget/native_widget_unittest.cc
diff --git a/ui/views/widget/native_widget_unittest.cc b/ui/views/widget/native_widget_unittest.cc
index 7c5c268872e595ba19bb864ee13d0cd165201dc9..653c9bed75dde9e35f6adce4a1b01679880983ee 100644
--- a/ui/views/widget/native_widget_unittest.cc
+++ b/ui/views/widget/native_widget_unittest.cc
@@ -82,6 +82,10 @@ TEST_F(NativeWidgetTest, GetTopLevelNativeWidget1) {
 
 // |toplevel_widget| has the toplevel NativeWidget.
 TEST_F(NativeWidgetTest, GetTopLevelNativeWidget2) {
+  // This test relies on GetContext(). http://crbug.com/663809.
+  if (IsAuraMusClient())
+    return;
+
   internal::NativeWidgetPrivate* child_widget = CreateNativeSubWidget();
   {
     ScopedTestWidget toplevel_widget(CreateNativeWidget());