Bug 727337 - Switch IsAllowedAttribute over to lossless conversion to avoid false positives; r=bz

content/base/src/mozSanitizingSerializer.cpp

@@ -554,10 +554,9 @@ mozSanitizingHTMLSerializer::IsAllowedAttribute(nsHTMLTag aTag,
   NS_ENSURE_TRUE(attr_bag, false);
 
   bool allowed;
-  nsAutoString attr(anAttributeName);
-  ToLowerCase(attr);
-  rv = attr_bag->Has(NS_LossyConvertUTF16toASCII(attr).get(),
-                     &allowed);
+  nsCAutoString attr;
+  ToLowerCase(NS_ConvertUTF16toUTF8(anAttributeName), attr);
+  rv = attr_bag->Has(attr.get(), &allowed);
   if (NS_FAILED(rv))
     return false;