Fix GN missing headers in //base

ash/wm/panels/panel_window_resizer_unittest.cc

Index: ash/wm/panels/panel_window_resizer_unittest.cc
diff --git a/ash/wm/panels/panel_window_resizer_unittest.cc b/ash/wm/panels/panel_window_resizer_unittest.cc
index 21bcf6673344e733ad9326bdf302be88593fdf1c..0ce01b79d6cd4d107b8b5e951ff034eff594a08c 100644
--- a/ash/wm/panels/panel_window_resizer_unittest.cc
+++ b/ash/wm/panels/panel_window_resizer_unittest.cc
@@ -24,7 +24,6 @@
 #include "ash/wm/window_properties.h"
 #include "ash/wm/window_state_aura.h"
 #include "base/i18n/rtl.h"
-#include "base/win/windows_version.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/base/hit_test.h"
@@ -32,6 +31,10 @@
 #include "ui/views/widget/widget.h"
 #include "ui/wm/core/window_util.h"
 
+#if defined(OS_WIN)
+#include "base/win/windows_version.h"
+#endif
+
 namespace ash {
 
 class PanelWindowResizerTest : public test::AshTestBase {