[Bindings] Unify a template block 'prepare_prototype_and_interface_object'

third_party/WebKit/Source/bindings/templates/partial_interface.cpp.tmpl

 {% extends 'interface_base.cpp.tmpl' %}
 
 {% set has_prepare_prototype_and_interface_object =
     unscopables or has_conditional_attributes_on_prototype or
     methods | conditionally_exposed(is_partial) %}
 {% set prepare_prototype_and_interface_object_func =
     '%s::preparePrototypeAndInterfaceObject' % v8_class_or_partial
     if has_prepare_prototype_and_interface_object
     else 'nullptr' %}
 
 
 {##############################################################################}
-{% block prepare_prototype_and_interface_object %}
-{% from 'interface.cpp.tmpl' import install_unscopables with context %}
-{% from 'interface.cpp.tmpl' import install_conditionally_enabled_attributes_on_prototype with context %}
-{% from 'methods.cpp.tmpl' import install_conditionally_enabled_methods with context %}
-{% if has_prepare_prototype_and_interface_object %}
-void {{v8_class_or_partial}}::preparePrototypeAndInterfaceObject(v8::Local<v8::Context> context, const DOMWrapperWorld& world, v8::Local<v8::Object> prototypeObject, v8::Local<v8::Function> interfaceObject, v8::Local<v8::FunctionTemplate> interfaceTemplate) {
-  {{v8_class}}::preparePrototypeAndInterfaceObject(context, world, prototypeObject, interfaceObject, interfaceTemplate);
-  v8::Isolate* isolate = context->GetIsolate();
-{% if unscopables %}
-  {{install_unscopables() | indent(2)}}
-{% endif %}
-{% if has_conditional_attributes_on_prototype %}
-  {{install_conditionally_enabled_attributes_on_prototype() | indent(2)}}
-{% endif %}
-{% if methods | conditionally_exposed(is_partial) %}
-  {{install_conditionally_enabled_methods() | indent(2)}}
-{% endif %}
-}
-{% endif %}
-
-{% endblock %}
-
-
-{##############################################################################}
 {% block partial_interface %}
 void {{v8_class_or_partial}}::initialize() {
   // Should be invoked from ModulesInitializer.
   {{v8_class}}::updateWrapperTypeInfo(
       &{{v8_class_or_partial}}::install{{v8_class}}Template,
       {% if needs_runtime_enabled_installer %}
       &{{v8_class_or_partial}}::installRuntimeEnabledFeatures,
       {% else %}
       nullptr,
       {% endif %}
       {{prepare_prototype_and_interface_object_func}});
   {% for method in methods %}
   {% if method.overloads and method.overloads.has_partial_overloads %}
   {{v8_class}}::register{{method.name | blink_capitalize}}MethodForPartialInterface(&{{cpp_class_or_partial}}V8Internal::{{method.name}}Method);
   {% endif %}
   {% endfor %}
 }
 
 {% endblock %}