IDL compiler: remove nop return from end of getters and setters

Source/bindings/templates/attributes.cpp

 {##############################################################################}
 {% macro attribute_getter(attribute) %}
 static void {{attribute.name}}AttributeGetter(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     {% if not attribute.is_static %}
     {{cpp_class_name}}* imp = {{v8_class_name}}::toNative(info.Holder());
     {% endif %}
     {% if attribute.is_nullable %}
     bool isNull = false;
     {{attribute.cpp_type}} value = {{attribute.cpp_value_original}};
     if (isNull) {
         v8SetReturnValueNull(info);
         return;
     }
     {% endif %}
     {% if attribute.is_keep_alive_for_gc %}
     {{attribute.cpp_type}} result = {{attribute.cpp_value}};
     if (result.get() && DOMDataStore::setReturnValueFromWrapper<{{attribute.v8_type}}>(info.GetReturnValue(), result.get()))
         return;
     v8::Handle<v8::Value> wrapper = toV8(result.get(), info.Holder(), info.GetIsolate());
     if (!wrapper.IsEmpty()) {
         V8HiddenPropertyName::setNamedHiddenReference(info.Holder(), "{{attribute.name}}", wrapper);
         v8SetReturnValue(info, wrapper);
     }
     {% else %}
     {{attribute.return_v8_value_statement}}
     {% endif %}
-    return;
 }
 {% endmacro %}
 
 
 {##############################################################################}
 {% macro attribute_getter_callback(attribute) %}
 static void {{attribute.name}}AttributeGetterCallback(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("Blink", "DOMGetter");
     {{cpp_class_name}}V8Internal::{{attribute.name}}AttributeGetter(name, info);
     TRACE_EVENT_SET_SAMPLING_STATE("V8", "Execution");
 }
 {% endmacro %}