repo: drop Python 3 warning

Lets get people to start filing bugs :).

Bug: https://crbug.com/gerrit/10418
Change-Id: I1d55bf0c60dbdbd6537d30b2cf9ea91d2928e387

repo

@@ -902,8 +902,4 @@ def main(orig_args):
 
 
 if __name__ == '__main__':
-  if ver[0] == 3:
-    print('warning: Python 3 support is currently experimental. YMMV.\n'
-          'Please use Python 2.7 instead.',
-          file=sys.stderr)
   main(sys.argv[1:])