refactor builder in kubectl factory

pkg/kubectl/cmd/describe.go

@@ -116,16 +116,10 @@ func RunDescribe(f cmdutil.Factory, out, cmdErr io.Writer, cmd *cobra.Command, a
 		return cmdutil.UsageErrorf(cmd, "Required resource not specified.")
 	}
 
-	mapper, typer, err := f.UnstructuredObject()
-	if err != nil {
-		return err
-	}
-
 	// include the uninitialized objects by default
 	// unless user explicitly set --include-uninitialized=false
 	includeUninitialized := cmdutil.ShouldIncludeUninitialized(cmd, true)
-	r := f.NewBuilder().
-		Unstructured(f.UnstructuredClientForMapping, mapper, typer).
+	r := f.NewUnstructuredBuilder().
 		ContinueOnError().
 		NamespaceParam(cmdNamespace).DefaultNamespace().AllNamespaces(allNamespaces).
 		FilenameParam(enforceNamespace, options).