Revert "Performance: Remap multiple items in UI"

This reverts commit 948211679f2a0681421160be0d3b90f507bc0be7.
This commit introduced some regressions in the test suite.
As this change is a core part of blender Bastien and I decided to revert
it as the solution isn't clear and needs more investigation.

The following tests FAILED:
	 62 - blendfile_liblink (SEGFAULT)
	 63 - blendfile_library_overrides (SEGFAULT)

It fails in (id_us_ensure_real)

1 files changed, 2 insertions, 6 deletions

diff --git a/source/blender/editors/include/ED_util.h b/source/blender/editors/include/ED_util.h
index 4e794838b2f..6bcddfa631a 100644
--- a/source/blender/editors/include/ED_util.h
+++ b/source/blender/editors/include/ED_util.h
@@ -33,7 +33,6 @@ extern "C" {
 struct GPUBatch;
 struct Main;
 struct bContext;
-struct IDRemapper;
 
 /* ed_util.c */
 
@@ -61,13 +60,10 @@ bool ED_editors_flush_edits(struct Main *bmain);
  *
  * \param new_id: may be NULL to unlink \a old_id.
  */
-void ED_spacedata_id_remap_single(struct ScrArea *area,
-                               struct SpaceLink *sl,
-                               struct ID *old_id,
-                               struct ID *new_id);
 void ED_spacedata_id_remap(struct ScrArea *area,
                            struct SpaceLink *sl,
-                           const struct IDRemapper *mappings);
+                           struct ID *old_id,
+                           struct ID *new_id);
 
 void ED_operatortypes_edutils(void);