Use codereview.settings style for GENERATE_GIT_NUMBER_FOOTERS.

R=sergiyb@chromium.org
BUG=642493

Change-Id: Ic4acf4076fdf27c1ed5e75f0ed1dda4b16d675fc
Reviewed-on: https://chromium-review.googlesource.com/414469
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
diff --git a/git_cl.py b/git_cl.py
index 7ab09d7..1227565 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -1016,7 +1016,7 @@
     return False
   keyvals = gclient_utils.ParseCodereviewSettingsContent(
       cr_settings_file.read())
-  return keyvals.get('generate-git-number-footers', '').lower() == 'true'
+  return keyvals.get('GENERATE_GIT_NUMBER_FOOTERS', '').lower() == 'true'
 
 
 def ShortBranchName(branch):