remove useless ontimeout/onerror
remove useless ontimeout/onerror

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