TBR: chat: Remove .v23 from all .gitignore files.

MultiPart: 15/25

Change-Id: I7daf255b5e50d14a57e70eb45530939dadeb4a60
diff --git a/.gitignore b/.gitignore
index 8319d26..0a15e07 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,4 @@
 /.jiri
-#TODO(nlacasse): Get rid of .v23 below once v23->jiri transition is complete.
 /build
 /clients/shell/credentials
 /clients/shell/go/bin
@@ -8,4 +7,3 @@
 /htmlReports
 /node_modules
 /tmp
-/.v23