Make the ninja_output.py work on python3 too.

This is the only required step so YCM works on vim with python3.

Review-Url: https://codereview.chromium.org/2704093004
Cr-Original-Commit-Position: refs/heads/master@{#451923}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 8aaeb7f1daf66c6045a1455bc2a6b4c045055c88
1 file changed