Where is com.google.gwt.core.client.Command?

I'm trying to implement deferred logic in my GWT client following this developer guide:

https://developers.google.com/web-toolkit/doc/2.4/DevGuideCodingBasicsDelayed#deferred

The guide says to implement the Command interface, but "Command" doesn't seem to exist in the 2.4.0 GWT SDK!  E.g. the following import fails:

import com.google.gwt.core.client.Command;

Is the dev guide and the online Javadoc out of sync with the SDK?  

Thanks,

Jason

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