System.ServiceDelegate.initialize() call causes error

I had a call to System.ServiceDelegate.initialize() in a project that worked fine before, but now under the latest SDK the line gives this compile error:

      Cannot find symbol ':initialize' on class definition '$.Toybox.System.ServiceDelegate'.

I'm not sure what this line is for.  I probably copied it from some other example program that was the framework for what I was doing.  My project uses communication, and a monkey barrel.

Is this not required or changed somehow ?