l20n-chrome-xul and l20n-chrome-html both have code that requires additional dependencies to land in Gecko and that cannot be currently tested. It's the code that we used for the interactive localization demo in London. The solutions from that demo are easily available for us to see in the l20n branch of gecko-dev on github. Let's remove this code from master and re-add it when we actually need it.
Created attachment 8799379 [details] [review] Pull request
Comment on attachment 8799379 [details] [review] Pull request r+!
https://hg.mozilla.org/projects/larch/rev/ec2da84091f9ec100e6a16b9e56ecca95404e479 Bug 1308896 - Remove unused language-registry-* observers. r=gandalf