Revert "Show sign on first line when line(s) deleted at start of file."

Signs aren't shown for deleted lines which aren't at the start of the
file.

This reverts commit 0fd18d66f6.

autoload/diff.vim

@@ -142,11 +142,7 @@ function! diff#process_added(modifications, from_count, to_count, to_line)
 endfunction
 
 function! diff#process_removed(modifications, from_count, to_count, to_line)
-  if a:to_line == 0
-    call add(a:modifications, [1, 'removed_first_line'])
-  else
-    call add(a:modifications, [0, 'removed'])
-  endif
+  call add(a:modifications, [a:to_line, 'removed'])
 endfunction
 
 function! diff#process_modified(modifications, from_count, to_count, to_line)

autoload/highlight.vim

@@ -34,7 +34,6 @@ function! highlight#define_signs()
   sign define GitGutterLineAdded
   sign define GitGutterLineModified
   sign define GitGutterLineRemoved
-  sign define GitGutterLineRemovedFirstLine
   sign define GitGutterLineModifiedRemoved
   sign define GitGutterDummy
 
@@ -47,7 +46,6 @@ function! highlight#define_sign_text()
   execute "sign define GitGutterLineAdded           text=" . g:gitgutter_sign_added
   execute "sign define GitGutterLineModified        text=" . g:gitgutter_sign_modified
   execute "sign define GitGutterLineRemoved         text=" . g:gitgutter_sign_removed
-  execute "sign define GitGutterLineRemovedFirstLine text=" . g:gitgutter_sign_removed_first_line
   execute "sign define GitGutterLineModifiedRemoved text=" . g:gitgutter_sign_modified_removed
 endfunction
 
@@ -70,7 +68,6 @@ function! highlight#define_sign_text_highlights()
   sign define GitGutterLineAdded           texthl=GitGutterAdd
   sign define GitGutterLineModified        texthl=GitGutterChange
   sign define GitGutterLineRemoved         texthl=GitGutterDelete
-  sign define GitGutterLineRemovedFirstLine texthl=GitGutterDelete
   sign define GitGutterLineModifiedRemoved texthl=GitGutterChangeDelete
 endfunction
 
@@ -79,13 +76,11 @@ function! highlight#define_sign_line_highlights()
     sign define GitGutterLineAdded           linehl=GitGutterAddLine
     sign define GitGutterLineModified        linehl=GitGutterChangeLine
     sign define GitGutterLineRemoved         linehl=GitGutterDeleteLine
-    sign define GitGutterLineRemovedFirstLine linehl=GitGutterDeleteLine
     sign define GitGutterLineModifiedRemoved linehl=GitGutterChangeDeleteLine
   else
     sign define GitGutterLineAdded           linehl=
     sign define GitGutterLineModified        linehl=
     sign define GitGutterLineRemoved         linehl=
-    sign define GitGutterLineRemovedFirstLine linehl=
     sign define GitGutterLineModifiedRemoved linehl=
   endif
 endfunction

autoload/hunk.vim

@@ -54,8 +54,7 @@ function! hunk#prev_hunk(count)
       if hunk[2] < current_line
         let hunk_count += 1
         if hunk_count == a:count
-          let target = hunk[2] == 0 ? 1 : hunk[2]
-          execute 'normal!' target . 'G'
+          execute 'normal!' hunk[2] . 'G'
           break
         endif
       endif
@@ -70,11 +69,6 @@ function! hunk#current_hunk()
   let current_line = line('.')
 
   for hunk in s:hunks
-    if current_line == 1 && hunk[2] == 0
-      let current_hunk = hunk
-      break
-    endif
-
     if current_line >= hunk[2] && current_line < hunk[2] + (hunk[3] == 0 ? 1 : hunk[3])
       let current_hunk = hunk
       break

autoload/utility.vim

@@ -88,8 +88,6 @@ function! utility#highlight_name_for_change(text)
     return 'GitGutterLineAdded'
   elseif a:text ==# 'removed'
     return 'GitGutterLineRemoved'
-  elseif a:text ==# 'removed_first_line'
-    return 'GitGutterLineRemovedFirstLine'
   elseif a:text ==# 'modified'
     return 'GitGutterLineModified'
   elseif a:text ==# 'modified_removed'