TBR: media-sharing: Remove .v23 from all .gitignore files.

MultiPart: 17/25

Change-Id: Ibf11b7b20fae6149da11943b16182209b4527e08
diff --git a/.gitignore b/.gitignore
index 722f46d..7f01442 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,4 @@
 /.jiri
-#TODO(nlacasse): Get rid of .v23 below once v23->jiri transition is complete.
-/.v23
 /android/.idea/
 /android/*.iml
 /android/app/*.iml