remove confusing flexibility for metadata interpretation

pkg/api/testapi/testapi.go

@@ -417,16 +417,6 @@ func (g TestGroup) Converter() runtime.ObjectConvertor {
 	return interfaces.ObjectConvertor
 }
 
-// MetadataAccessor returns the MetadataAccessor for the API version to test against,
-// as set by the KUBE_TEST_API env var.
-func (g TestGroup) MetadataAccessor() meta.MetadataAccessor {
-	interfaces, err := legacyscheme.Registry.GroupOrDie(g.externalGroupVersion.Group).InterfacesFor(g.externalGroupVersion)
-	if err != nil {
-		panic(err)
-	}
-	return interfaces.MetadataAccessor
-}
-
 // SelfLink returns a self link that will appear to be for the version Version().
 // 'resource' should be the resource path, e.g. "pods" for the Pod type. 'name' should be
 // empty for lists.