Mojo C++ bindings: rename ArrayValidateParams for clarity

mojo/public/tools/bindings/generators/cpp_templates/union_serialization_definition.tmpl

 {%- set mojom_type = union|get_qualified_name_for_kind %}
 {%- set data_type = union|get_qualified_name_for_kind(internal=True) %}
 
 namespace internal {
 
 // static
 size_t UnionSerializerImpl<{{mojom_type}}Ptr>::PrepareToSerialize(
     {{mojom_type}}Ptr& input,
     bool inlined,
     SerializationContext* context) {
@@ skipping 43 matching lines @@
     switch (input->which()) {
 {%  for field in union.fields %}
       case {{mojom_type}}::Tag::{{field.name|upper}}: {
 {%    if field.kind|is_object_kind %}
 {%-     set serializer_type = field.kind|unmapped_type_for_serializer %}
 {%      if field.kind|is_union_kind %}
         mojo::internal::Serialize<{{serializer_type}}>(
             *(input_acc.data()->{{field.name}}), buf,
             &result->data.f_{{field.name}}.ptr, false, context);
 {%      elif field.kind|is_array_kind or field.kind|is_map_kind %}
-        const ArrayValidateParams {{field.name}}_validate_params(
-            {{field.kind|get_array_validate_params_ctor_args|indent(16)}});
+        const ContainerValidateParams {{field.name}}_validate_params(
+            {{field.kind|get_container_validate_params_ctor_args|indent(16)}});
         mojo::internal::Serialize<{{serializer_type}}>(
             *(input_acc.data()->{{field.name}}), buf,
             &result->data.f_{{field.name}}.ptr, &{{field.name}}_validate_params,
             context);
 {%      else %}
         mojo::internal::Serialize<{{serializer_type}}>(
             *(input_acc.data()->{{field.name}}), buf,
             &result->data.f_{{field.name}}.ptr, context);
 {%-     endif %}
 {%    elif field.kind|is_any_handle_kind %}
@@ skipping 69 matching lines @@
 {%- endfor %}
     }
     *output = std::move(result);
   } else {
     output->reset();
   }
   return success;
 }
 
 }  // namespace internal