Changes views_aura_mus_unittests to create DesktopNativeWidgetAura

ui/views/test/platform_test_helper.cc

Index: ui/views/test/platform_test_helper.cc
diff --git a/ui/views/test/platform_test_helper.cc b/ui/views/test/platform_test_helper.cc
index b6626189fa390b2141ef70e1ff3704344714770f..fc461f531429d2a68f495fdf107410c1574cff9f 100644
--- a/ui/views/test/platform_test_helper.cc
+++ b/ui/views/test/platform_test_helper.cc
@@ -7,19 +7,30 @@
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
+#include "ui/views/widget/widget.h"
+
+#if defined(USE_AURA)
+#include "ui/aura/window.h"
+#endif
 
 namespace views {
 namespace {
 
+#if defined(USE_AURA)
 class DefaultPlatformTestHelper : public PlatformTestHelper {
  public:
   DefaultPlatformTestHelper() {}
-
   ~DefaultPlatformTestHelper() override {}
 
+  // PlatformTestHelper:
+  void SimulateNativeDestroy(Widget* widget) override {
+    delete widget->GetNativeView();
+  }
+
  private:
   DISALLOW_COPY_AND_ASSIGN(DefaultPlatformTestHelper);
 };
+#endif
 
 PlatformTestHelper::Factory test_helper_factory;
 bool is_mus = false;
@@ -32,12 +43,14 @@ void PlatformTestHelper::set_factory(const Factory& factory) {
   test_helper_factory = factory;
 }
 
+#if defined(USE_AURA)
 // static
 std::unique_ptr<PlatformTestHelper> PlatformTestHelper::Create() {
   return !test_helper_factory.is_null()
              ? test_helper_factory.Run()
              : base::WrapUnique(new DefaultPlatformTestHelper);
 }
+#endif
 
 // static
 void PlatformTestHelper::SetIsMus() {