Fix various typos, error handling for GN auto-roller.

R=brettw@chromium.org

Review URL: https://codereview.chromium.org/1255253004

Cr-Original-Commit-Position: refs/heads/master@{#340777}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 68ae5bcd387dbed627ed0053f3de1be188016938
1 file changed
tree: b9a13e060ee36439816eb3a81b85e9f21af8c605
  1. tools/