Favour event.keyIdentifier over event.key.
Favour event.keyIdentifier over event.key.

See #2147.

Chromium's implementation of event.key currently fails to take account
of keyboard mappings (e.g. neo2).

Here, we favour using event.keyIdentifier (while it's available) as a
workaround.

gdh1995/vimium,mrmr1993/vimium,willsALMANJ/vimium,gdh1995/vimium,mrmr1993/vimium,smblott-github/vimium,mrmr1993/vimium,willsALMANJ/vimium,poacher2k/vimium,philc/vimium,poacher2k/vimium,smblott-github/vimium,decaffeinate-examples/vimium,philc/vimium,smblott-github/vimium,decaffeinate-examples/vimium,gdh1995/vimium,poacher2k/vimium,philc/vimium,willsALMANJ/vimium,decaffeinate-examples/vimium