IDL: Drop [PerContextEnabled] extended attribute

Source/bindings/templates/interface.cpp

 {% extends 'interface_base.cpp' %}
 
 
 {##############################################################################}
 {% block indexed_property_getter %}
 {% if indexed_property_getter and not indexed_property_getter.is_custom %}
 {% set getter = indexed_property_getter %}
 static void indexedPropertyGetter(uint32_t index, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     {{cpp_class}}* impl = {{v8_class}}::toImpl(info.Holder());
@@ skipping 888 matching lines @@
 
 {##############################################################################}
 {% block install_conditional_attributes %}
 {% from 'attributes.cpp' import attribute_configuration with context %}
 {% if has_conditional_attributes %}
 void {{v8_class}}::installConditionallyEnabledProperties(v8::Local<v8::Object> instanceObject, v8::Isolate* isolate)
 {
     v8::Local<v8::Object> prototypeObject = v8::Local<v8::Object>::Cast(instanceObject->GetPrototype());
     ExecutionContext* context = toExecutionContext(prototypeObject->CreationContext());
 
-    {% for attribute in attributes if attribute.per_context_enabled_function or attribute.exposed_test %}
-    {% filter per_context_enabled(attribute.per_context_enabled_function) %}
+    {% for attribute in attributes if attribute.exposed_test %}
     {% filter exposed(attribute.exposed_test) %}
     {% if attribute.is_expose_js_accessors %}
     static const V8DOMConfiguration::AccessorConfiguration accessorConfiguration = {{attribute_configuration(attribute)}};
     V8DOMConfiguration::installAccessor(isolate, prototypeObject, accessorConfiguration);
     {% else %}
     static const V8DOMConfiguration::AttributeConfiguration attributeConfiguration = {{attribute_configuration(attribute)}};
     V8DOMConfiguration::installAttribute(isolate, instanceObject, prototypeObject, attributeConfiguration);
     {% endif %}
     {% endfilter %}
-    {% endfilter %}
     {% endfor %}
 }
 
 {% endif %}
 {% endblock %}
 
 
 {##############################################################################}
 {% block prepare_prototype_object %}
 {% from 'methods.cpp' import install_conditionally_enabled_methods with context %}
@@ skipping 111 matching lines @@
 }
 
 {% for method in methods if method.overloads and method.overloads.has_partial_overloads %}
 void {{v8_class}}::register{{method.name | blink_capitalize}}MethodForPartialInterface(void (*method)(const v8::FunctionCallbackInfo<v8::Value>&))
 {
     {{cpp_class}}V8Internal::{{method.name}}MethodForPartialInterface = method;
 }
 {% endfor %}
 {% endif %}
 {% endblock %}