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I suspect that the crashes reported in M17 are because the SQLitePersistentCookieStore is closed while it was still loading.

This CL adds checks that should abort all tasks that access db_, if db_ is NULL.

R=rdsmith@chromium.org
BUG=106722
TEST=None


Review URL: http://codereview.chromium.org/8855009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113498 0039d316-1c4b-4281-b951-d872f2087c98