Upgrade closure library version

And remove a workaround fixed upstream.

work in progress 
We use `event.changedTouches` when it is  defined. https://github.com/google/closure-library/commit/116609a6de5a687a85299f3feeb6e044efa0d1a5 does not use `changedTouches` so I'm a bit uncertain that this commit really fixes the problem for us.