Fix GN missing headers in //base

chrome/test/ppapi/ppapi_browsertest.cc

Index: chrome/test/ppapi/ppapi_browsertest.cc
diff --git a/chrome/test/ppapi/ppapi_browsertest.cc b/chrome/test/ppapi/ppapi_browsertest.cc
index e78ed0a507d0e1c981e5c5ae6048fb2241dc3eb5..87c5f8dcbb47115cd3945979f087a9ae23c79c87 100644
--- a/chrome/test/ppapi/ppapi_browsertest.cc
+++ b/chrome/test/ppapi/ppapi_browsertest.cc
@@ -7,7 +7,6 @@
 #include "base/macros.h"
 #include "base/path_service.h"
 #include "base/test/test_timeouts.h"
-#include "base/win/windows_version.h"
 #include "build/build_config.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
@@ -37,6 +36,10 @@
 #include "base/mac/mac_util.h"
 #endif
 
+#if defined(OS_WIN)
+#include "base/win/windows_version.h"
+#endif
+
 using content::RenderViewHost;
 
 // This macro finesses macro expansion to do what we want.