Remove pinetrail from the gem idle test

There is a bug on pinetrail where we never reach 0 idle objects, and
I'm not going to track it down.

BUG=chromium:416203
TEST=none

Change-Id: Iab4087cd360e3a745bfe975d796e8ad470cc0e74
Signed-off-by: Stéphane Marchesin <marcheu@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/219180
Reviewed-by: Ilja Friedel <ihf@chromium.org>
1 file changed