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- Log when the test waits for chrome.exe processes to exit.
- Wait until after chrome processes are gone before emitting their log.
- Emit chrome's log when the User Data dir cannot be deleted.

BUG=907979
R=rogerta@chromium.org

Change-Id: I3d142f4e3d23f79e67c367bee6b7477e66744a35
Reviewed-on: https://chromium-review.googlesource.com/c/1354452Reviewed-by: Roger Tawa <rogerta@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613113}