Kill old plugin conflict guard

plugin/fugitive.vim

@@ -89,17 +89,9 @@ function! s:define_commands()
   endfor
 endfunction
 
-function! s:compatibility_check()
-  if exists('b:git_dir') && exists('*GitBranchInfoCheckGitDir') && !exists('g:fugitive_did_compatibility_warning')
-    let g:fugitive_did_compatibility_warning = 1
-    call s:warn("See http://github.com/tpope/vim-fugitive/issues#issue/1 for why you should remove git-branch-info.vim")
-  endif
-endfunction
-
 augroup fugitive_utility
   autocmd!
   autocmd User Fugitive call s:define_commands()
-  autocmd VimEnter * call s:compatibility_check()
 augroup END
 
 let s:abstract_prototype = {}