chromeos-login: Increase wait for Chrome to shutdown to 1m during tests
chromeos-login: Increase wait for Chrome to shutdown to 1m during tests

BUG=chromium-os:17899
TEST=kill -STOP <chrome-browser-pid>
pkill session_manager
look in /var/log/messages for message about killing process

I see no messages though.

Change-Id: I1070299151be52892fb259e28b6bf32328104fef
Reviewed-on: http://gerrit.chromium.org/gerrit/5289
Reviewed-by: Chris Masone <98e3d65c6b0e9e2391eb4c2e8b1e572b77e544ed@chromium.org>
Tested-by: Ken Mixter <feb6aa3e7f1e44c9811411c1ed2accffd28a2d10@chromium.org>

chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager