bindings: Adds check for attributes on prototype chains in CSSStyleDeclaration.

Source/bindings/templates/interface_base.cpp

Index: Source/bindings/templates/interface_base.cpp
diff --git a/Source/bindings/templates/interface_base.cpp b/Source/bindings/templates/interface_base.cpp
index 8dff9e29529e28d2437a189124c9a3223268bdce..ea5c732e40872d01d3d2a217d839c10bde592e0b 100644
--- a/Source/bindings/templates/interface_base.cpp
+++ b/Source/bindings/templates/interface_base.cpp
@@ -393,13 +393,15 @@ static void install{{v8_class}}Template(v8::Local<v8::FunctionTemplate> function
            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 %}
+        {# TODO(yukishiino): Determine how to treat Window interface. #}
+        {% if interface_name != 'Window' %}
         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 %}
+        {# TODO(yukishiino): Determine how to treat Window interface. #}
+        {% if not is_override_builtins and interface_name != 'Window' %}
         config.flags = static_cast<v8::PropertyHandlerFlags>(static_cast<int>(config.flags) | static_cast<int>(v8::PropertyHandlerFlags::kNonMasking));
         {% endif %}
         functionTemplate->{{set_on_template}}()->SetHandler(config);