Added hyphen-only options

Some options have words separated by underscores. Added options with
same name and underscores replaced by hyphens.

BUG=400953

Review URL: https://codereview.chromium.org/436963005

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@288366 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/git_reparent_branch.py b/git_reparent_branch.py
index f9bf9c5..fe79d3c 100755
--- a/git_reparent_branch.py
+++ b/git_reparent_branch.py
@@ -69,7 +69,7 @@
   manual_merge_base(branch, mbase, new_parent)
 
   # TODO(iannucci): ONLY rebase-update the branch which moved (and dependants)
-  return git_rebase_update.main(['--no_fetch'])
+  return git_rebase_update.main(['--no-fetch'])
 
 
 if __name__ == '__main__':  # pragma: no cover