Delete lib/chrome_committer.py

After crrev.com/c/3340415, there should no longer be any usages of
chrome_committer.py, so should be safe to delete & move a bit of its
parser logic into scripts/chrome_chromeos_lkgm.py.

BUG=b:205987120
TEST=unittest

Change-Id: Idc974990d0e4a59a8e8c4828637c13907e2e3571
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3365865
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Tested-by: Ben Pastene <bpastene@chromium.org>
diff --git a/scripts/chrome_chromeos_lkgm_unittest.py b/scripts/chrome_chromeos_lkgm_unittest.py
index 9842f32..85dd5af 100644
--- a/scripts/chrome_chromeos_lkgm_unittest.py
+++ b/scripts/chrome_chromeos_lkgm_unittest.py
@@ -18,8 +18,7 @@
 
   def setUp(self):
     """Common set up method for all tests."""
-    self.committer = chrome_chromeos_lkgm.ChromeLKGMCommitter(
-        'user@test.org', '1001.0.0')
+    self.committer = chrome_chromeos_lkgm.ChromeLKGMCommitter('1001.0.0')
     self.old_lkgm = None
 
   @mock.patch('chromite.lib.gob_util.GetFileContentsOnHead')
@@ -51,8 +50,7 @@
   @mock.patch('chromite.lib.gob_util.GetFileContentsOnHead')
   def testVersionWithChromeBranch(self, mock_get_file):
     """Tests passing a version with a chrome branch strips the branch."""
-    self.committer = chrome_chromeos_lkgm.ChromeLKGMCommitter(
-        'user@test.org', '1003.0.0-rc2')
+    self.committer = chrome_chromeos_lkgm.ChromeLKGMCommitter('1003.0.0-rc2')
     mock_get_file.return_value = '1002.0.0'
 
     with mock.patch.object(self.committer._gerrit_helper, 'CreateChange') as cg: