Remove outdated copy of download_material_design_icons
Remove outdated copy of download_material_design_icons

The current copy is in //sky/sdk/lib.

TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1160393003

chinmaygarde/mojo,jianglu/mojo,chinmaygarde/mojo,jianglu/mojo,afandria/mojo,jianglu/mojo,jianglu/mojo,afandria/mojo,chinmaygarde/mojo,jianglu/mojo,jianglu/mojo,afandria/mojo,chinmaygarde/mojo,chinmaygarde/mojo,afandria/mojo,afandria/mojo,chinmaygarde/mojo,chinmaygarde/mojo,afandria/mojo,chinmaygarde/mojo,afandria/mojo,chinmaygarde/mojo,jianglu/mojo,jianglu/mojo,afandria/mojo