Fix ChromeOS debug buildbot failure.
Fix ChromeOS debug buildbot failure.

Triggering ownership check on key load failure creates an infinite loop when
owner key file is missing.

BUG=none
TEST=ChromeOS debug buildbot should be green.
TBR=cmasone@chromium.org

git-svn-id: http://src.chromium.org/svn/trunk/src@58331 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a21f14002b2a3c4f06411e6bbbc065f01f6ddca2
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser