win: Work on reducing number of style plugin warnings.

ui/views/test/test_views_delegate_aura.cc

Index: ui/views/test/test_views_delegate_aura.cc
diff --git a/ui/views/test/test_views_delegate_aura.cc b/ui/views/test/test_views_delegate_aura.cc
index 8eb1a86b99259c805f10b52372c412c64acfabf0..a6329762bdcedc7b4a41fcfbfcd5fa849172367e 100644
--- a/ui/views/test/test_views_delegate_aura.cc
+++ b/ui/views/test/test_views_delegate_aura.cc
@@ -30,6 +30,12 @@ TestViewsDelegate::~TestViewsDelegate() {
     ViewsDelegate::views_delegate = NULL;
 }
 
+#if defined(OS_WIN)
+HICON TestViewsDelegate::GetSmallWindowIcon() const {
+  return nullptr;
+}
+#endif
+
 void TestViewsDelegate::OnBeforeWidgetInit(
     Widget::InitParams* params,
     internal::NativeWidgetDelegate* delegate) {