Make sure path to resource_ids file is relative.  An earlier change that made the path absolute caused some Mac bots to barf on update.
Make sure path to resource_ids file is relative.  An earlier change
that made the path absolute caused some Mac bots to barf on update.

BUG=none

Review URL: https://chromiumcodereview.appspot.com/9956017
megamanfx/grit-i18n,invalidstatement/grit-i18n,lhopps/grit-i18n,metasmile/grit-i18n,sevansahumIlovemuhammad/grit-i18n,skidzen/grit-i18n,skidzen/grit-i18n,korusdipl/grit-i18n,willbittner/grit-i18n,qjw/grit-i18n,metasmile/grit-i18n,joisig/grit-i18n,megamanfx/grit-i18n,sevansahumIlovemuhammad/grit-i18n,korusdipl/grit-i18n,qjw/grit-i18n,willbittner/grit-i18n,invalidstatement/grit-i18n,joisig/grit-i18n,lhopps/grit-i18n,CrankWheel/grit-i18n