Make missing/wrong croslib nonfatal error.
Make missing/wrong croslib nonfatal error.

Mitsuru landed CL http://codereview.chromium.org/2032006 that always creates
GoogleAuthenticator if --login_manager switch is enabled. GoogleAuthenticator
constructor has check for croslib that fails if croslib version doesn't match
or you are debugging login manager on Linux. So it broke previous behavior that
missing croslib was not a fatal error and user was able to see error message on
login screen (now user can't - only black screen after several Chrome restarts).

BUG=none
TEST=Run Chrome built for Chrome OS on Linux with --login_manager command line switch, it shouldn't crash with CHECK fail about croslib.

Review URL: http://codereview.chromium.org/2082001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@47166 0039d316-1c4b-4281-b951-d872f2087c98

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