headless: Make API generator more robust against weird enum literals

headless/lib/browser/type_conversions_h.template

Index: headless/lib/browser/type_conversions_h.template
diff --git a/headless/lib/browser/type_conversions_h.template b/headless/lib/browser/type_conversions_h.template
index 286b0e5ea65eac3374a6e844ed111ff039bf90db..1c918ac9ea3f138223957684314682c830ada722 100644
--- a/headless/lib/browser/type_conversions_h.template
+++ b/headless/lib/browser/type_conversions_h.template
@@ -20,7 +20,7 @@ namespace internal {
 template <>
 struct FromValue<{{namespace}}::{{type.id}}> {
   static {{namespace}}::{{type.id}} Parse(const base::Value& value, ErrorReporter* errors) {
-      {% set default = namespace + '::' + type.id + '::' + type.enum[0] | dash_to_camelcase | camelcase_to_hacker_style | upper | mangle_enum %}
+      {% set default = namespace + '::' + type.id + '::' + type.enum[0] | sanitize_literal | dash_to_camelcase | camelcase_to_hacker_style | upper %}
     std::string string_value;
     if (!value.GetAsString(&string_value)) {
       errors->AddError("string enum value expected");
@@ -29,7 +29,7 @@ struct FromValue<{{namespace}}::{{type.id}}> {
     }
       {% for literal in type.enum %}
     if (string_value == "{{literal}}")
-      return {{namespace}}::{{type.id}}::{{literal | dash_to_camelcase | camelcase_to_hacker_style | upper | mangle_enum}};
+      return {{namespace}}::{{type.id}}::{{literal | sanitize_literal | dash_to_camelcase | camelcase_to_hacker_style | upper }};
       {% endfor %}
     errors->AddError("invalid enum value");
     return {{default}};
@@ -40,7 +40,7 @@ template <typename T>
 std::unique_ptr<base::Value> ToValueImpl(const {{namespace}}::{{type.id}}& value, T*) {
   switch (value) {
       {% for literal in type.enum %}
-    case {{namespace}}::{{type.id}}::{{literal | dash_to_camelcase | camelcase_to_hacker_style | upper | mangle_enum}}:
+    case {{namespace}}::{{type.id}}::{{literal | sanitize_literal | dash_to_camelcase | camelcase_to_hacker_style | upper }}:
       return base::WrapUnique(new base::StringValue("{{literal}}"));
       {% endfor %}
   };