Modernize some devtools code using deprecated ListValue

Editor assessment

Reasonable chore, though the type is arguable: replacing deprecated `ListValue` usage is classic refactoring, and `refactor` would signal no behavior change more explicitly to release tooling. The word 'some' is vague — which parts of devtools? A `devtools` scope would pin that down. The subject is otherwise clear, imperative, and length-appropriate, and naming the deprecated class gives readers a concrete anchor. No body was provided, which is acceptable for routine modernization, but a line confirming behavior is unchanged would pre-empt reviewer questions.