Logs: Dump logs to new location

Needed b/c X runs as xorg user now, not root.

BUG=chromium:326650
TEST=tested dumping logs manually

Change-Id: Id86758bdb009d2d1df6bfdc1f7b8a71bf30929fa
Reviewed-on: https://chromium-review.googlesource.com/179176
Reviewed-by: Charles Mooney <charliemooney@chromium.org>
Commit-Queue: Andrew de los Reyes <adlr@chromium.org>
Tested-by: Andrew de los Reyes <adlr@chromium.org>