gistfile1.txt

git grep -P '<if expr=".*">' -- chrome/browser/resources/settings ui/webui/resources | cut -d'"' -f2 | sort | uniq -c | sort -rh 
     99 chromeos
     33 not chromeos
      6 not is_macosx
      6 _google_chrome and not chromeos
      6 _google_chrome
      4 use_nss_certs
      4 is_win or is_macosx
      3 use_vulcanize
      2 not use_vulcanize
      2 chromeos or is_win
      1 use_nss_certs or is_win or is_macosx
      1 not is_macosx and not is_ios
      1 not is_ios
      1 not is_android
      1 not chromeos and not is_win
      1 (not chromeos and is_posix) or is_win or is_macosx
      1 not android and not chromeos
      1 is_win or is_macosx or is_ios
      1 is_macosx or is_ios
      1 is_linux and not chromeos
      1 is_ios