Fix git_nav_downstream.py when origin/master is checked out.
Also fix missing copyright notices.
R=agable@chromium.org
BUG=261738
Review URL: https://codereview.chromium.org/196433003
git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@256777 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/git_map.py b/git_map.py
index f93e6b8..7001325 100755
--- a/git_map.py
+++ b/git_map.py
@@ -1,4 +1,8 @@
#!/usr/bin/env python
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
"""
Provides an augmented `git log --graph` view. In particular, it also annotates
commits with branches + tags that point to them. Items are colorized as follows: