Those are headers, not the implementations. If you find the .m files that go with those, that'd be awesome, but they do not appear to release them.

Wouldn't they only be required to provide the .m files if the WAK classes were statically compiled with the WebCore code?

They are. For example, in this[0] crash report (found with a quick Google search), on line 77, it clearly shows that the WAKWindow function is inside the WebCore binary (statically linked). You can also find this by running class-dump on a copy of WebCore from iOS: there are many linked-in WAK classes do not have source code released as the GPL requires.

[0]: http://pastebin.com/GvFVfWHV

Interesting. Cheers for the concrete info.

Ah, that's it.

Neither OSX or iOS release the implementation, though.