/usr/share/vim/vim74/syntax/indent.vim is in vim-runtime 2:7.4.1689-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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" Language:         indent(1) configuration file
" Maintainer:       Nikolai Weibull <now@bitwi.se>
" Latest Revision:  2010-01-23
"   indent_is_bsd:  If exists, will change somewhat to match BSD implementation
"
" TODO: is the deny-all (a la lilo.vim nice or no?)...
"       irritating to be wrong to the last char...
"       would be sweet if right until one char fails
if exists("b:current_syntax")
  finish
endif
let s:cpo_save = &cpo
set cpo&vim
setlocal iskeyword+=-,+
syn match   indentError   '\S\+'
syn keyword indentTodo    contained TODO FIXME XXX NOTE
syn region  indentComment start='/\*' end='\*/'
                          \ contains=indentTodo,@Spell
syn region  indentComment start='//' skip='\\$' end='$'
                          \ contains=indentTodo,@Spell
if !exists("indent_is_bsd")
  syn match indentOptions '-i\|--indentation-level\|-il\|--indent-level'
                        \ nextgroup=indentNumber skipwhite skipempty
endif
syn match   indentOptions '-\%(bli\|c\%([bl]i\|[dip]\)\=\|di\=\|ip\=\|lc\=\|pp\=i\|sbi\|ts\|-\%(brace-indent\|comment-indentation\|case-brace-indentation\|declaration-comment-column\|continuation-indentation\|case-indentation\|else-endif-column\|line-comments-indentation\|declaration-indentation\|indent-level\|parameter-indentation\|line-length\|comment-line-length\|paren-indentation\|preprocessor-indentation\|struct-brace-indentation\|tab-size\)\)'
                        \ nextgroup=indentNumber skipwhite skipempty
syn match   indentNumber  display contained '\d\+\>'
syn match   indentOptions '-T'
                        \ nextgroup=indentIdent skipwhite skipempty
syn match   indentIdent   display contained '\h\w*\>'
syn keyword indentOptions -bacc --blank-lines-after-ifdefs
                        \ -bad --blank-lines-after-declarations
                        \ -badp --blank-lines-after-procedure-declarations
                        \ -bap --blank-lines-after-procedures
                        \ -bbb --blank-lines-before-block-comments
                        \ -bbo --break-before-boolean-operator
                        \ -bc --blank-lines-after-commas
                        \ -bfda --break-function-decl-args
                        \ -bfde --break-function-decl-args-end
                        \ -bl --braces-after-if-line
                        \ -blf --braces-after-func-def-line
                        \ -bls --braces-after-struct-decl-line
                        \ -br --braces-on-if-line
                        \ -brf --braces-on-func-def-line
                        \ -brs --braces-on-struct-decl-line
                        \ -bs --Bill-Shannon --blank-before-sizeof
                        \ -c++ --c-plus-plus
                        \ -cdb --comment-delimiters-on-blank-lines
                        \ -cdw --cuddle-do-while
                        \ -ce --cuddle-else
                        \ -cs --space-after-cast
                        \ -dj --left-justify-declarations
                        \ -eei --extra-expression-indentation
                        \ -fc1 --format-first-column-comments
                        \ -fca --format-all-comments
                        \ -gnu --gnu-style
                        \ -h --help --usage
                        \ -hnl --honour-newlines
                        \ -kr --k-and-r-style --kernighan-and-ritchie --kernighan-and-ritchie-style
                        \ -lp --continue-at-parentheses
                        \ -lps --leave-preprocessor-space
                        \ -nbacc --no-blank-lines-after-ifdefs
                        \ -nbad --no-blank-lines-after-declarations
                        \ -nbadp --no-blank-lines-after-procedure-declarations
                        \ -nbap --no-blank-lines-after-procedures
                        \ -nbbb --no-blank-lines-before-block-comments
                        \ -nbbo --break-after-boolean-operator
                        \ -nbc --no-blank-lines-after-commas
                        \ -nbfda --dont-break-function-decl-args
                        \ -nbfde --dont-break-function-decl-args-end
                        \ -nbs --no-Bill-Shannon --no-blank-before-sizeof
                        \ -ncdb --no-comment-delimiters-on-blank-lines
                        \ -ncdw --dont-cuddle-do-while
                        \ -nce --dont-cuddle-else
                        \ -ncs --no-space-after-casts
                        \ -ndj --dont-left-justify-declarations
                        \ -neei --no-extra-expression-indentation
                        \ -nfc1 --dont-format-first-column-comments
                        \ -nfca --dont-format-comments
                        \ -nhnl --ignore-newlines
                        \ -nip --dont-indent-parameters --no-parameter-indentation
                        \ -nlp --dont-line-up-parentheses
                        \ -nlps --remove-preprocessor-space
                        \ -npcs --no-space-after-function-call-names
                        \ -npmt
                        \ -npro --ignore-profile
                        \ -nprs --no-space-after-parentheses
                        \ -npsl --dont-break-procedure-type
                        \ -nsaf --no-space-after-for
                        \ -nsai --no-space-after-if
                        \ -nsaw --no-space-after-while
                        \ -nsc --dont-star-comments
                        \ -nsob --leave-optional-blank-lines
                        \ -nss --dont-space-special-semicolon
                        \ -nut --no-tabs
                        \ -nv --no-verbosity
                        \ -o --output
                        \ -o --output-file
                        \ -orig --berkeley --berkeley-style --original --original-style
                        \ -pcs --space-after-procedure-calls
                        \ -pmt --preserve-mtime
                        \ -prs --space-after-parentheses
                        \ -psl --procnames-start-lines
                        \ -saf --space-after-for
                        \ -sai --space-after-if
                        \ -saw --space-after-while
                        \ -sc --start-left-side-of-comments
                        \ -sob --swallow-optional-blank-lines
                        \ -ss --space-special-semicolon
                        \ -st --standard-output
                        \ -ut --use-tabs
                        \ -v --verbose
                        \ -version --version
                        \ -linux --linux-style
if exists("indent_is_bsd")
  syn keyword indentOptions -ip -ei -nei
endif
if exists("c_minlines")
  let b:c_minlines = c_minlines
else
  if !exists("c_no_if0")
    let b:c_minlines = 50       " #if 0 constructs can be long
  else
    let b:c_minlines = 15       " mostly for () constructs
  endif
endif
hi def link indentError   Error
hi def link indentComment Comment
hi def link indentTodo    Todo
hi def link indentOptions Keyword
hi def link indentNumber  Number
hi def link indentIdent   Identifier
let b:current_syntax = "indent"
let &cpo = s:cpo_save
unlet s:cpo_save
 |