Fixes possible crash in visitdb. As far as I can tell the archive_db_ is NULL, leading to this crash.
Fixes possible crash in visitdb. As far as I can tell the archive_db_
is NULL, leading to this crash.

BUG=8932
TEST=none

Review URL: http://codereview.chromium.org/53112

git-svn-id: http://src.chromium.org/svn/trunk/src@12599 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 83df25412ccc1cc93e06412162ebdda3b24ead71
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