headless: Make API generator more robust against weird enum literals

headless/lib/browser/types_h.template

Index: headless/lib/browser/types_h.template
diff --git a/headless/lib/browser/types_h.template b/headless/lib/browser/types_h.template
index 25b341d89dd4360752f1afe9b2c8bf0a92af5d95..51bd895d033f08f4f5c66fe33ea0c9d2346fcb95 100644
--- a/headless/lib/browser/types_h.template
+++ b/headless/lib/browser/types_h.template
@@ -39,7 +39,7 @@ namespace {{domain.domain | camelcase_to_hacker_style}} {
     {% if "enum" in type %}
 enum class {{type.id}} {
       {% for literal in type.enum %}
-  {{ literal | dash_to_camelcase | camelcase_to_hacker_style | upper | mangle_enum}}{{',' if not loop.last}}
+  {{ literal | sanitize_literal | dash_to_camelcase | camelcase_to_hacker_style | upper }}{{',' if not loop.last}}
       {% endfor %}
 };