Remove many redundant handlers

ale_linters/html/htmlhint.vim

@@ -7,42 +7,9 @@ endif
 
 let g:loaded_ale_linters_html_htmlhint = 1
 
-function! ale_linters#html#htmlhint#Handle(buffer, lines) abort
-    " Matches patterns lines like the following:
-    "stdin:7:10: <title></title> must not be empty. [error/title-require]
-
-    let l:pattern = '^stdin:\(\d\+\):\(\d\+\): \(.\+\)$'
-    let l:output = []
-
-    for l:line in a:lines
-        let l:match = matchlist(l:line, l:pattern)
-
-        if len(l:match) == 0
-            continue
-        endif
-
-        let l:line = l:match[1] + 0
-        let l:col = l:match[2] + 0
-        let l:text = l:match[3]
-
-        " vcol is Needed to indicate that the column is a character.
-        call add(l:output, {
-        \   'bufnr': a:buffer,
-        \   'lnum': l:line,
-        \   'vcol': 0,
-        \   'col': l:col,
-        \   'text': l:text,
-        \   'type': 'E',
-        \   'nr': -1,
-        \})
-    endfor
-
-    return l:output
-endfunction
-
 call ale#linter#Define('html', {
 \   'name': 'htmlhint',
 \   'executable': 'htmlhint',
 \   'command': 'htmlhint --format=unix stdin',
-\   'callback': 'ale_linters#html#htmlhint#Handle',
+\   'callback': 'ale#handlers#HandleUnixFormatAsError',
 \})