Generate a templated Clone method for all mojo structs.

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

Index: mojo/public/tools/bindings/generators/cpp_templates/wrapper_class_definition.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/wrapper_class_definition.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/wrapper_class_definition.tmpl
index 2bd7ceb337dbfb7f7fef8fdc0158b68060132605..0bb1cda14b5a6917971ebe470edf935e6bc7de2b 100644
--- a/mojo/public/tools/bindings/generators/cpp_templates/wrapper_class_definition.tmpl
+++ b/mojo/public/tools/bindings/generators/cpp_templates/wrapper_class_definition.tmpl
@@ -13,17 +13,3 @@
 
 {{struct.name}}::~{{struct.name}}() {
 }
-
-{%  if struct|is_cloneable_kind %}
-{{struct.name}}Ptr {{struct.name}}::Clone() const {
-  {{struct.name}}Ptr rv(New());
-{%-   for field in struct.fields %}
-{%-     if field.kind|is_object_kind and not field.kind|is_string_kind %}
-  rv->{{field.name}} = {{field.name}}.Clone();
-{%-     else %}
-  rv->{{field.name}} = {{field.name}};
-{%-     endif %}
-{%-   endfor %}
-  return rv;
-}
-{%  endif %}