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The code for the PageControlNavigator class is stored in navigator.js (which gets added automatically by the Navigation App template in VS), but the code for the PageControl class is stored in base.js. What’s the reason for having a completely separate JS file just for the PageControlNavigator code?
I doubt anyone but Microsoft can tell you definitively, but the separation is likely because navigator.js is designed to be modified by the developer to suit their needs (for example, custom handling of navigation events or changing how the keyboard controls navigation,) whereas base.js cannot/should not be modified.
navigator.js is really just a convenient way to deal with the Page Controls. It does not actually do anything to implement them. You could roll your own navigator.js if you wanted to, and the page controls would work the exact same way.