Add ssl-key-log-file to bad flags/env vars infobar

This adds the --ssl-key-log-file flag to the set of bad flags that we
warn users about. It also adds a check for the environment var
SSLKEYLOGFILE (which enables the same functionality) and shows a similar
infobar warning in that case.

Screenshots:
* --ssl-key-log-file flag:
    https://screenshot.googleplex.com/d7CHZ9s3i2y.png
* SSLKEYLOGFILE env var:
    https://screenshot.googleplex.com/P9TY8QYBwAK.png

Bug: 991290
Change-Id: I2847a5fd63565c36a0705ff212936631521f9b92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1739162
Reviewed-by: Tommy Martino <tmartino@chromium.org>
Commit-Queue: Christopher Thompson <cthomp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684898}
3 files changed