remove some dead code (#8223)
remove some dead code (#8223)


dennisobrien/bokeh,jakirkham/bokeh,bokeh/bokeh,mindriot101/bokeh,mindriot101/bokeh,jakirkham/bokeh,mindriot101/bokeh,stonebig/bokeh,stonebig/bokeh,jakirkham/bokeh,bokeh/bokeh,bokeh/bokeh,ericmjl/bokeh,bokeh/bokeh,ericmjl/bokeh,dennisobrien/bokeh,bokeh/bokeh,ericmjl/bokeh,timsnyder/bokeh,timsnyder/bokeh,jakirkham/bokeh,stonebig/bokeh,timsnyder/bokeh,ericmjl/bokeh,timsnyder/bokeh,timsnyder/bokeh,stonebig/bokeh,dennisobrien/bokeh,dennisobrien/bokeh,jakirkham/bokeh,ericmjl/bokeh,mindriot101/bokeh,dennisobrien/bokeh