Use main branch as the default branch

R=apolito@google.com

Change-Id: I6a2ed557b9e8d45194b2fe4ea5327ce62020733c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3000134
Reviewed-by: Anthony Polito <apolito@google.com>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>
diff --git a/git_cl.py b/git_cl.py
index 349f35e..5340962 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -104,8 +104,8 @@
 POSTUPSTREAM_HOOK = '.git/hooks/post-cl-land'
 DESCRIPTION_BACKUP_FILE = '.git_cl_description_backup'
 REFS_THAT_ALIAS_TO_OTHER_REFS = {
-    'refs/remotes/origin/lkgr': 'refs/remotes/origin/master',
-    'refs/remotes/origin/lkcr': 'refs/remotes/origin/master',
+    'refs/remotes/origin/lkgr': 'refs/remotes/origin/main',
+    'refs/remotes/origin/lkcr': 'refs/remotes/origin/main',
 }
 
 DEFAULT_OLD_BRANCH = 'refs/remotes/origin/master'