[Chromecast] ATV: don't include logs from renderer process in logfile.

Higher level of restrictions in M turn these into SELinux denials.

R=halliwell@chromium.org,slan@chromium.org
BUG=internal b/22888548

Review URL: https://codereview.chromium.org/1311493002

Cr-Commit-Position: refs/heads/master@{#344848}
1 file changed