Do not attempt to validate SU token upon crash restart.

BUG=311856
R=nkostylev@chromium.org

Review URL: https://codereview.chromium.org/85593004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237158 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237158