use non-masking, string interceptors in generated bindings

Source/bindings/templates/interface_base.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file has been auto-generated by {{code_generator}}. DO NOT MODIFY!
 
 #include "config.h"
 {% filter conditional(conditional_string) %}
 #include "{{v8_class_or_partial}}.h"
 
@@ skipping 380 matching lines @@
            '%sV8Internal::namedPropertyQueryCallback' % cpp_class
            if named_property_getter.is_enumerable else '0' %}
     {% set named_property_deleter_callback =
            '%sV8Internal::namedPropertyDeleterCallback' % cpp_class
            if named_property_deleter else '0' %}
     {% set named_property_enumerator_callback =
            '%sV8Internal::namedPropertyEnumeratorCallback' % cpp_class
            if named_property_getter.is_enumerable else '0' %}
     {
         v8::NamedPropertyHandlerConfiguration config({{named_property_getter_callback}}, {{named_property_setter_callback}}, {{named_property_query_callback}}, {{named_property_deleter_callback}}, {{named_property_enumerator_callback}});
+        {% if not named_property_getter.is_custom %}
+        config.flags = static_cast<v8::PropertyHandlerFlags>(static_cast<int>(config.flags) | static_cast<int>(v8::PropertyHandlerFlags::kOnlyInterceptStrings));
+        {% endif %}
         {% if named_property_getter.do_not_check_security %}
         config.flags = v8::PropertyHandlerFlags::kAllCanRead;
         {% endif %}
+        {% if not is_override_builtins and not named_property_getter.is_custom %}
+        config.flags = static_cast<v8::PropertyHandlerFlags>(static_cast<int>(config.flags) | static_cast<int>(v8::PropertyHandlerFlags::kNonMasking));
+        {% endif %}
         functionTemplate->{{set_on_template}}()->SetHandler(config);
     }
     {% endif %}
     {% if iterator_method %}
     {% filter per_context_enabled(iterator_method.per_context_enabled_function) %}
     {% filter exposed(iterator_method.exposed_test) %}
     {% filter runtime_enabled(iterator_method.runtime_enabled_function) %}
     static const V8DOMConfiguration::SymbolKeyedMethodConfiguration symbolKeyedIteratorConfiguration = { v8::Symbol::GetIterator, {{cpp_class_or_partial}}V8Internal::iteratorMethodCallback, 0, V8DOMConfiguration::ExposedToAllScripts };
     V8DOMConfiguration::installMethod(isolate, prototypeTemplate, defaultSignature, v8::DontDelete, symbolKeyedIteratorConfiguration);
     {% endfilter %}{# runtime_enabled() #}
@@ skipping 84 matching lines @@
 {% endfor %}
 {% for attribute in attributes if attribute.is_implemented_in_private_script %}
 {{attribute_getter_implemented_in_private_script(attribute)}}
 {% if attribute.has_setter %}
 {{attribute_setter_implemented_in_private_script(attribute)}}
 {% endif %}
 {% endfor %}
 {% block partial_interface %}{% endblock %}
 } // namespace blink
 {% endfilter %}