git cl: remove temporary workaround of invisible unicode char in emails.

PolyGerrit used to surround emails with invisible unicode char, which
resulted in reviewers not being found by Gerrit. It has since been
fixed (handled in Google internal bug b/34702620).

R=sergiyb@chromium.org

Change-Id: I43ade0ef23d88611081744eff57129a69b5176c8
Reviewed-on: https://chromium-review.googlesource.com/472808Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>

git_cl.py

@@ -2958,12 +2958,7 @@ class _GerritChangelistImpl(_ChangelistCodereviewBase):
 
     reviewers = change_desc.get_reviewers()
     if reviewers:
-      # TODO(tandrii): remove this horrible hack once (Poly)Gerrit fixes their
-      # side for real (b/34702620).
-      def clean_invisible_chars(email):
-        return email.decode('unicode_escape').encode('ascii', 'ignore')
-      refspec_opts.extend('r=' + clean_invisible_chars(email).strip()
-                          for email in reviewers)
+      refspec_opts.extend('r=' + email.strip() for email in reviewers)
 
     if options.private:
       refspec_opts.append('draft')