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The bot runner dies sometimes when running this test. Disable the part
of the test that launches Chrome to see if that makes the failures go
away. This change also makes the logs a bit more informative by added
date, time, file, and line info in the same format as Chrome's logging.
It also enables verbose logging for Chrome's installer.

BUG=402081
NOTRY=true
TBR=gab@chromium.org

Review URL: https://codereview.chromium.org/545373004

Cr-Commit-Position: refs/heads/master@{#294180}