It seems like webrtc has a copy of src? 
https://cs.chromium.org/search/?q=PrintContext::~PrintContext&type=cs

If you go to the above link you will see dupicated results for every file. One in the webrtc repo and the other in the chromium one. 

This is without the package being limited to chromium obviously. 
Also the webrtc repo isn't grokable.