Linux Aura: Use Aura theme on all windows when 'Use Classic theme' is used

ui/views/widget/desktop_aura/desktop_native_widget_aura.h

Index: ui/views/widget/desktop_aura/desktop_native_widget_aura.h
diff --git a/ui/views/widget/desktop_aura/desktop_native_widget_aura.h b/ui/views/widget/desktop_aura/desktop_native_widget_aura.h
index c28cea443560559aea5569cbb2486d571be3c8d0..194df82e8b7f154dc2a7f41a9f1ff045ab616edd 100644
--- a/ui/views/widget/desktop_aura/desktop_native_widget_aura.h
+++ b/ui/views/widget/desktop_aura/desktop_native_widget_aura.h
@@ -97,6 +97,9 @@ class VIEWS_EXPORT DesktopNativeWidgetAura
   // we are being activated/deactivated.
   void HandleActivationChanged(bool active);
 
+  // Overridden from internal::NativeWidgetPrivate:
+  gfx::NativeWindow GetNativeWindow() const override;
+
  protected:
   // Overridden from internal::NativeWidgetPrivate:
   void InitNativeWidget(const Widget::InitParams& params) override;
@@ -108,7 +111,6 @@ class VIEWS_EXPORT DesktopNativeWidgetAura
   Widget* GetWidget() override;
   const Widget* GetWidget() const override;
   gfx::NativeView GetNativeView() const override;
-  gfx::NativeWindow GetNativeWindow() const override;
   Widget* GetTopLevelWidget() override;
   const ui::Compositor* GetCompositor() const override;
   const ui::Layer* GetLayer() const override;