Add back 'android' and 'ios' for is_posix, and fix check for bsd.
Add back 'android' and 'ios' for is_posix, and fix check for bsd.

BUG=none
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/135273011
joisig/grit-i18n,megamanfx/grit-i18n,qjw/grit-i18n,lhopps/grit-i18n,willbittner/grit-i18n,willbittner/grit-i18n,sevansahumIlovemuhammad/grit-i18n,korusdipl/grit-i18n,skidzen/grit-i18n,qjw/grit-i18n,joisig/grit-i18n,invalidstatement/grit-i18n,korusdipl/grit-i18n,invalidstatement/grit-i18n,lhopps/grit-i18n,metasmile/grit-i18n,megamanfx/grit-i18n,metasmile/grit-i18n,sevansahumIlovemuhammad/grit-i18n,CrankWheel/grit-i18n,skidzen/grit-i18n