[shotwell] Remove dead code

[Jens Georg <jensgeorg src gnome org>]

commit b59db2dec66117b5b07345bb20b7c6d0d597d474
Author: Jens Georg <mail jensge org>
Date:   Sat Jul 8 10:33:15 2017 +0200

    Remove dead code

 src/SortedList.vala |   14 --------------
 1 files changed, 0 insertions(+), 14 deletions(-)
---
diff --git a/src/SortedList.vala b/src/SortedList.vala
index 727b523..20e6771 100644
--- a/src/SortedList.vala
+++ b/src/SortedList.vala
@@ -6,20 +6,6 @@
 
 public delegate int64 Comparator(void *a, void *b);
 
-public int64 file_comparator(void *a, void *b) {
-    string? path_a = ((File *) a)->get_path();
-    string? path_b = ((File *) b)->get_path();
-    
-    // if both are null, treat as equal; if one but not the other, prioritize  the non-null
-    if (path_a == null)
-        return (path_b == null) ? 0 : 1;
-    
-    if (path_b == null)
-        return -1;
-    
-    return strcmp(path_a.collate_key_for_filename(), path_b.collate_key_for_filename());
-}
-
 public class SortedList<G> : Object, Gee.Traversable<G>, Gee.Iterable<G>, Gee.Collection<G> {
     private Gee.ArrayList<G> list;
     private unowned Comparator? cmp;