Capitalize WTF-based type traits as lower_case

tools/clang/rewrite_to_chrome_style/tests/fields-original.cc

Index: tools/clang/rewrite_to_chrome_style/tests/fields-original.cc
diff --git a/tools/clang/rewrite_to_chrome_style/tests/fields-original.cc b/tools/clang/rewrite_to_chrome_style/tests/fields-original.cc
index d2c1b4dc81a68022890d63ea1d910aa46258d650..5f0fda0fdf44a0ab57cd17d1223d4ed43823d120 100644
--- a/tools/clang/rewrite_to_chrome_style/tests/fields-original.cc
+++ b/tools/clang/rewrite_to_chrome_style/tests/fields-original.cc
@@ -65,10 +65,22 @@ union U {
 // https://crbug.com/640749#c1: Some type traits are inside blink namespace.
 struct IsGarbageCollectedMixin {
   static const bool value = true;
+  static const bool safeToCompareToEmptyOrDeleted = false;
 };
 
 }  // namespace blink
 
+namespace not_blink {
+
+// These are traits for WTF types that may be defined outside of blink such
+// as in mojo. But their names are unique so we can globally treat them as
+// type traits for renaming.
+struct GloballyKnownTraits {
+  static const bool safeToCompareToEmptyOrDeleted = false;
+};
+
+}  // namespace not_blink
+
 namespace WTF {
 
 // We don't want to capitalize fields in type traits