IDL: Drop value conversion (V8 -> C++) macros from generated code

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 31 matching lines @@
     {% endif %}
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 {% endif %}
 {% endblock %}
 
 
 {##############################################################################}
 {% block indexed_property_setter %}
+{% from 'conversions.cpp' import v8_value_to_local_cpp_value %}
 {% if indexed_property_setter and not indexed_property_setter.is_custom %}
 {% set setter = indexed_property_setter %}
 static void indexedPropertySetter(uint32_t index, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     {{cpp_class}}* impl = {{v8_class}}::toImpl(info.Holder());
-    {{setter.v8_value_to_local_cpp_value}};
+    {{v8_value_to_local_cpp_value(setter) | indent}}
     {% if setter.has_exception_state %}
     ExceptionState exceptionState(ExceptionState::IndexedSetterContext, "{{interface_name}}", info.Holder(), info.GetIsolate());
     {% endif %}
     {% if setter.has_type_checking_interface %}
     {# Type checking for interface types (if interface not implemented, throw
        TypeError), per http://www.w3.org/TR/WebIDL/#es-interface #}
     if (!propertyValue{% if setter.is_nullable %} && !isUndefinedOrNull(v8Value){% endif %}) {
         exceptionState.throwTypeError("The provided value is not of type '{{setter.idl_type}}'.");
         exceptionState.throwIfNeeded();
         return;
@@ skipping 135 matching lines @@
     {% endif %}
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 {% endif %}
 {% endblock %}
 
 
 {##############################################################################}
 {% block named_property_setter %}
+{% from 'conversions.cpp' import v8_value_to_local_cpp_value %}
 {% if named_property_setter and not named_property_setter.is_custom %}
 {% set setter = named_property_setter %}
 static void namedPropertySetter(v8::Local<v8::Name> name, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     if (!name->IsString())
         return;
     auto nameString = name.As<v8::String>();
     {% if not is_override_builtins %}
     if (info.Holder()->HasRealNamedProperty(nameString))
         return;
     if (!info.Holder()->GetRealNamedPropertyInPrototypeChain(nameString).IsEmpty())
         return;
 
     {% endif %}
     {% if setter.has_exception_state %}
     v8::String::Utf8Value namedProperty(nameString);
     ExceptionState exceptionState(ExceptionState::SetterContext, *namedProperty, "{{interface_name}}", info.Holder(), info.GetIsolate());
     {% endif %}
     {{cpp_class}}* impl = {{v8_class}}::toImpl(info.Holder());
     {# v8_value_to_local_cpp_value('DOMString', 'nameString', 'propertyName') #}
-    TOSTRING_VOID(V8StringResource<>, propertyName, nameString);
-    {{setter.v8_value_to_local_cpp_value}};
+    V8StringResource<> propertyName(nameString);
+    if (!propertyName.prepare())
+        return;
+    {{v8_value_to_local_cpp_value(setter) | indent}}
     {% if setter.has_type_checking_interface %}
     {# Type checking for interface types (if interface not implemented, throw
        TypeError), per http://www.w3.org/TR/WebIDL/#es-interface #}
     if (!propertyValue{% if setter.is_nullable %} && !isUndefinedOrNull(v8Value){% endif %}) {
         exceptionState.throwTypeError("The provided value is not of type '{{setter.idl_type}}'.");
         exceptionState.throwIfNeeded();
         return;
     }
     {% endif %}
     {% set setter_name = setter.name or 'anonymousNamedSetter' %}
@@ skipping 279 matching lines @@
 {% if has_event_constructor %}
 static void constructor(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ConstructionContext, "{{interface_name}}", info.Holder(), info.GetIsolate());
     if (info.Length() < 1) {
         exceptionState.throwTypeError("An event name must be provided.");
         exceptionState.throwIfNeeded();
         return;
     }
 
-    TOSTRING_VOID(V8StringResource<>, type, info[0]);
+    V8StringResource<> type(info[0]);
+    if (!type.prepare())
+        return;
     {% for attribute in any_type_attributes %}
     v8::Local<v8::Value> {{attribute.name}};
     {% endfor %}
     {{cpp_class}}Init eventInit;
     if (info.Length() >= 2) {
         Dictionary options(info[1], info.GetIsolate(), exceptionState);
         if (!initialize{{cpp_class}}(eventInit, options, exceptionState, info)) {
             exceptionState.throwIfNeeded();
             return;
         }
@@ skipping 434 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 %}