That's because they don't use Places, so they don't NEED a colon. GWT is a set of tools (hence "toolkit") that work well together, but each has its purpose, and should IMO be learned separately before being used together.
BTW, when using Places, you can do better with a widget that calls PlaceController#goTo instead of History#newItem. But that's something you could quite easily add later (you'd need to give that widget a PlaceController, PlaceHistoryMapper to populate the link's href --for right clicks: copy link target, open in new tab/window, etc.-- and the target Place).
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